| ⓘ 'Aeschynite Group' Formula: AD2O6 |
| ⓘ Aeschynite-(Y) Formula: Y(TiNb)O6 Description: Pseudo-hexagonal crystals (described as priorite, analyzed by Mignot) |
| ⓘ Albite Formula: Na(AlSi3O8) |
| ⓘ Albite var. Cleavelandite Formula: Na(AlSi3O8) Localities: Reported from at least 7 localities in this region. |
| ⓘ Allanite-(Ce) Formula: (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| ⓘ 'Allanite Group' Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) Localities: Tomboarivo pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarAmbatofotsikely pegmatite, Betsohana, Mandoto, Vakinankaratra, MadagascarAmbondrona pegmatite, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmbatovohangy pegmatite, Vinaninony Atsimo, Faratsiho, Vakinankaratra, MadagascarBelamosina (Ambatofotsy) pegmatites, Ambatonikolahy, Betafo District, Vakinankaratra, Madagascar Description: Masses up to several kilos. |
| ⓘ Almandine Formula: Fe2+3Al2(SiO4)3 |
ⓘ 'Almandine-Pyrope Series'References: Rakotondrazafy, Amos Fety Michel; Giuliani, Gaston; Ohnenstetter, Daniel; Fallick, Anthony E.; Rakotosamizanany, Saholy; Andriamamonjy, Alfred; Ralantoarison, Théogène; Razanatseheno, Madison; Offant, Yohann; Garnier, Virginie; et al. (2008) Gem corundum deposits of Madagascar: A review. Ore Geology Reviews, 34 (1-2). 134-154 doi:10.1016/j.oregeorev.2007.05.001 |
| ⓘ 'Almandine-Spessartine Series' |
| ⓘ Amblygonite Formula: LiAl(PO4)F |
| ⓘ Amesite Formula: Mg2Al(AlSiO5)(OH)4 |
| ⓘ Anatase Formula: TiO2 Localities: Reported from at least 6 localities in this region. |
| ⓘ Anatase var. Xanthitane Formula: TiO2 |
| ⓘ Andalusite Formula: Al2(SiO4)O |
| ⓘ 'Andradite-Grossular Series' |
| ⓘ Anhydrite Formula: CaSO4 |
| ⓘ Annite Formula: KFe2+3(AlSi3O10)(OH)2 Colour: Black Description: Occurs in large plates. |
| ⓘ Anorthite Formula: Ca(Al2Si2O8) References: Rakotondrazafy, Amos Fety Michel; Giuliani, Gaston; Ohnenstetter, Daniel; Fallick, Anthony E.; Rakotosamizanany, Saholy; Andriamamonjy, Alfred; Ralantoarison, Théogène; Razanatseheno, Madison; Offant, Yohann; Garnier, Virginie; et al. (2008) Gem corundum deposits of Madagascar: A review. Ore Geology Reviews, 34 (1-2). 134-154 doi:10.1016/j.oregeorev.2007.05.001 Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Anorthite var. Bytownite Formula: (Ca,Na)[Al(Al,Si)Si2O8] References: Rakotondrazafy, Amos Fety Michel; Giuliani, Gaston; Ohnenstetter, Daniel; Fallick, Anthony E.; Rakotosamizanany, Saholy; Andriamamonjy, Alfred; Ralantoarison, Théogène; Razanatseheno, Madison; Offant, Yohann; Garnier, Virginie; et al. (2008) Gem corundum deposits of Madagascar: A review. Ore Geology Reviews, 34 (1-2). 134-154 doi:10.1016/j.oregeorev.2007.05.001 Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Anorthite var. Labradorite Formula: (Ca,Na)[Al(Al,Si)Si2O8] References: Rakotondrazafy, Amos Fety Michel; Giuliani, Gaston; Ohnenstetter, Daniel; Fallick, Anthony E.; Rakotosamizanany, Saholy; Andriamamonjy, Alfred; Ralantoarison, Théogène; Razanatseheno, Madison; Offant, Yohann; Garnier, Virginie; et al. (2008) Gem corundum deposits of Madagascar: A review. Ore Geology Reviews, 34 (1-2). 134-154 doi:10.1016/j.oregeorev.2007.05.001 Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Anthophyllite Formula: ◻Mg2Mg5(Si8O22)(OH)2 |
| ⓘ 'Apatite' Formula: Ca5(PO4)3A Localities: Reported from at least 9 localities in this region. |
| ⓘ Aragonite Formula: CaCO3 |
| ⓘ 'Asbestos' |
| ⓘ 'Ashanite' Formula: (Nb,Ta,U,Fe,Mn)4O8 |
| ⓘ Augelite Formula: Al2(PO4)(OH)3 |
| ⓘ Augite Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ Autunite Formula: Ca(UO2)2(PO4)2 · 10-12H2O Localities: Vatovory (Vinaninkarena Uranium deposit), Anjanamanjaka, Vinaninkarena, Antsirabe II District, Vakinankaratra, MadagascarMaharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAmbolotara, Betafo, Betafo District, Vakinankaratra, MadagascarTomboarivo pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, Madagascar ? (more information) |
| ⓘ Axinite-(Mn) Formula: Ca2Mn2+Al2BSi4O15(OH) Description: Knut Edvard Larsen collection, identified by XRD at MGM, Oslo 1998. |
| ⓘ Baryte Formula: BaSO4 Localities: Tsilaizina pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarVatovory (Vinaninkarena Uranium deposit), Anjanamanjaka, Vinaninkarena, Antsirabe II District, Vakinankaratra, MadagascarAmpozana Massif, Andrembesoa, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Béhierite (TL) Formula: Ta(BO4) Localities: Reported from at least 9 localities in this region. Habit: Octahedral crystals Colour: Grayish-pink |
| ⓘ Berlinite Formula: AlPO4 |
| ⓘ Bertrandite Formula: Be4(Si2O7)(OH)2 |
| ⓘ Beryl Formula: Be3Al2(Si6O18) |
| ⓘ Beryl var. Alkali-beryl Formula: Be3Al2(Si6O18) Localities: Maharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, MadagascarAnkitsikitsika, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
ⓘ Beryl var. AquamarineLocalities: Ambatofotsikely pegmatite, Betsohana, Mandoto, Vakinankaratra, MadagascarTsaramanga pegmatite, Mahaiza, Betafo District, Vakinankaratra, MadagascarMahaiza, Betafo District, Vakinankaratra, MadagascarTsarafara Nord (Ambalaroy), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Beryl var. Caesium Beryl Formula: Be3Al2(Si6O18) Localities: Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarTsarafara Sud (Ankadilava), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Beryl var. Morganite Formula: Be3Al2(Si6O18) Localities: Mt Olotsingy, Vakinankaratra, MadagascarManapa pegmatite Field, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarTsarafara Sud (Ankadilava), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, Madagascar |
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ Bismite Formula: Bi2O3 Localities: Reported from at least 6 localities in this region. |
| ⓘ Bismuthinite Formula: Bi2S3 Localities: Fefena pegmatite, Betafo District, Vakinankaratra, MadagascarSahamandrevo pegmatite, Ambohimasina, Betafo District, Vakinankaratra, MadagascarAmpangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, MadagascarTsaramanga pegmatite, Mahaiza, Betafo District, Vakinankaratra, MadagascarSamiresy, Tritriva, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Bismutite Formula: (BiO)2CO3 |
| ⓘ Bityite (TL) Formula: CaLiAl2(AlBeSi2O10)(OH)2 Localities: Reported from at least 9 localities in this region. Habit: pseudohexagonal barrelshaped aggregates with curved top (polysyntetic twins)up to 2 mm long; fine lamelles Colour: white; whith-yellowish Description: The typematerial of bityite was found in a pegmatite dike situated about 300 m N of the Maharitra workings (Behier (1960)
Found on tourmaline or quartz |
| ⓘ Boralsilite Formula: Al16B6O30(Si2O7) References: Novák, Milan, Cempírek, Jan, Gadas, Petr, Škoda, Radek, Vašinová Galiová, Michaela, Pezzotta, Federico, Groat, Lee A. (2015) Boralsilite and Li, Be-bearing "Boron Mullite" Al8B2Si2O19, Breakdown products of spodumene from the Manjaka pegmatite, Sahatany valley, Madagascar. The Canadian Mineralogist, 53 (2) 357-374 doi:10.3749/canmin.1400092 |
| ⓘ Calcite Formula: CaCO3 Localities: Reported from at least 8 localities in this region. |
| ⓘ Cassiterite Formula: SnO2 Localities: Reported from at least 6 localities in this region. |
| ⓘ Celestine Formula: SrSO4 |
| ⓘ Cesiokenopyrochlore (TL) Formula: ◻Nb2(O,OH)6(Cs,◻) Type Locality: Description: Found in a single sample as rough equant crystals up to 0.05 mm in size intergrown with behierite and rynersonite on the surface of a crystal of behierite. References: Agakhanov, Atali A., Kasatkin, Anatoly V., Britvin, Sergey N., Siidra, Oleg I., Pautov, Leonid A., Pekov, Igor V., Karpenko, Vladimir Yu. (2021) Cesiokenopyrochlore, the First Natural Niobate with an Inverse Pyrochlore Structure. The Canadian Mineralogist, 59 (1) 149-157 doi:10.3749/canmin.2000056 |
| ⓘ 'Chabazite' |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Chambersite Formula: Mn2+3(B7O13)Cl Colour: Colorless Description: Tiny inclusions in rhodizite-londonite. |
ⓘ Chevkinite-(Ce)Formula: Ce4(Ti,Fe2+,Fe3+)5O8(Si2O7)2 Description: Samples labelled "chevkinite-(Ce) has been showed to be allanite-(Ce). See Larsen (2003) |
| ⓘ 'Chlorite Group' |
| ⓘ 'Chrome-Spinel (of Dana)' Description: Inclusions in corundum. References: Rakotondrazafy, Amos Fety Michel; Giuliani, Gaston; Ohnenstetter, Daniel; Fallick, Anthony E.; Rakotosamizanany, Saholy; Andriamamonjy, Alfred; Ralantoarison, Théogène; Razanatseheno, Madison; Offant, Yohann; Garnier, Virginie; et al. (2008) Gem corundum deposits of Madagascar: A review. Ore Geology Reviews, 34 (1-2). 134-154 doi:10.1016/j.oregeorev.2007.05.001 |
| ⓘ Chrysoberyl Formula: BeAl2O4 Localities: Anjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, MadagascarAntsofimbato pegmatites, Mangarano, Antsirabe II District, Vakinankaratra, MadagascarAmbatomalaza (Vohimasina), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 Localities: Ampangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, MadagascarMandro, Betafo District, Vakinankaratra, MadagascarAmbohitranana, Mahaiza, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Clinochlore var. Ripidolite Formula: (Mg,Fe,Al)6(Si,Al)4O10(OH)8 |
| ⓘ Clinohumite Formula: Mg9(SiO4)4F2 |
ⓘ 'Clinopyroxene Subgroup'References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Columbite-(Fe) Formula: Fe2+Nb2O6 Localities: Reported from at least 7 localities in this region. |
| ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series' |
| ⓘ Columbite-(Mn) Formula: Mn2+Nb2O6 |
ⓘ 'Columbite-(Mn)-Tantalite-(Mn) Series'Localities: Ilontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarEstatoby (Antanetinilapa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ 'Columbite-Tantalite' |
| ⓘ Cookeite Formula: (LiAl4◻)[AlSi3O10](OH)8 Localities: Reported from at least 9 localities in this region. |
| ⓘ Cordierite Formula: Mg2Al4Si5O18 Localities: Ambatomanoana, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarAmbohitranana, Mahaiza, Betafo District, Vakinankaratra, MadagascarIbity massif, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntanety, Betafo District, Vakinankaratra, MadagascarNW of Tsilaizina Mountain, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Corundum Formula: Al2O3 Localities: Reported from at least 8 localities in this region. |
| ⓘ Corundum var. Ruby Formula: Al2O3 Localities: Antsahanandriana mining area, Ambohimandroso, Antanifotsy District, Vakinankaratra, MadagascarSoamiakatra, Ambohitsimanova, Antsirabe II District, Vakinankaratra, MadagascarAnjomakely, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Corundum var. Sapphire Formula: Al2O3 Localities: Andranomadio, Faratsiho, Vakinankaratra, MadagascarSapphire deposits, Soanindrariny, Antsirabe II District, Vakinankaratra, MadagascarAntsahanandriana mining area, Ambohimandroso, Antanifotsy District, Vakinankaratra, MadagascarAnjomakely, Antsirabe II District, Vakinankaratra, MadagascarRavine near Mt. Vontovorona, Soanindrariny, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Cryptomelane Formula: K(Mn4+7Mn3+)O16 |
| ⓘ Danburite Formula: CaB2Si2O8 |
| ⓘ Darrellhenryite Formula: Na(Al2Li)Al6(Si6O18)(BO3)3(OH)3O References: Gadas, P., Novák, M., Vašinová Galiová, M., Pezzotta, F. (2023) Chemical composition of tourmalines from the Manjaka pegmatite and its exocontact, Sahatany Valley, Madagascar. Journal of Geosciences, 68 (3) 185-202 doi:10.3190/jgeosci.374 |
| ⓘ Diopside Formula: CaMgSi2O6 Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntaboaka North, Mangarano, Antsirabe II District, Vakinankaratra, MadagascarSoamiakatra, Ambohitsimanova, Antsirabe II District, Vakinankaratra, MadagascarMaharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar Description: Found in the exocontact zones of the pegmatite |
| ⓘ Dolomite Formula: CaMg(CO3)2 Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAndrianampy dolomite quarry, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Dravite Formula: NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ 'Dravite-Schorl Series' |
ⓘ 'Dravite-Uvite Series'References: Novák, Milan, Cempírek, Jan, Gadas, Petr, Škoda, Radek, Vašinová Galiová, Michaela, Pezzotta, Federico, Groat, Lee A. (2015) Boralsilite and Li, Be-bearing "Boron Mullite" Al8B2Si2O19, Breakdown products of spodumene from the Manjaka pegmatite, Sahatany valley, Madagascar. The Canadian Mineralogist, 53 (2) 357-374 doi:10.3749/canmin.1400092 |
| ⓘ Dumortierite Formula: Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| ⓘ Edenite Formula: NaCa2Mg5(Si7Al)O22(OH)2 |
| ⓘ Elbaite Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
ⓘ 'Elbaite-Liddicoatite Series'Localities: Ambalabe pegmatite, Manapa pegmatite Field, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarAntsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, Madagascar ? (more information)Sarodivotra, Anjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, Madagascar ? (more information) |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) Localities: Reported from at least 6 localities in this region. |
| ⓘ Ertlite (TL) Formula: NaAl3Al6(Si4B2O18)(BO3)3(OH)3O Type Locality: References: Cempírek, J., Jonsson, E., Skřápková, L., Škoda, R., Čopjaková, R., Groat, L.A., Kampf,
A.R., Lussier, A.J., Hawthorne, F.C. and Haifler, J. (2024) Ertlite, IMA 2023-086. CNMNC
Newsletter 79, Mineralogical Magazine, 88 Cempírek, Jan; Jonsson, Erik; Skřápková, Lenka; Škoda, Radek; Kolitsch, Uwe; Čopjaková, Renata; Groat, Lee A.; Kampf, Anthony R.; Lussier, Aaron J.; Hawthorne, Frank C.; et al. (2025) Ertlite, NaAl3Al6(Si4B2O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. American Mineralogist, 110 (12). 1865-1876 doi:10.2138/am-2025-9816 |
| ⓘ Euclase Formula: BeAl(SiO4)(OH) |
| ⓘ Euxenite-(Y) Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| ⓘ Evansite Formula: Al3(PO4)(OH)6 · 6H2O |
| ⓘ 'Faratsihite' (FRL) Type Locality: Habit: massive Colour: white creme Description: The typematerial of the now discredited faratshite was found in a roadcut about 10 km from Faratsiho on the road to Sambaina. It was found in an altered volcanique rock (basalt or trachyte)as an elliptical mass of 2 x 1 meter |
ⓘ 'Fayalite-Forsterite Series'Localities: Soamiakatra, Ambohitsimanova, Antsirabe II District, Vakinankaratra, MadagascarAntsirabe I District, Vakinankaratra, MadagascarTritriva Lake, Tritriva, Betafo District, Vakinankaratra, Madagascar |
ⓘ 'Feldspar Group'Localities: Reported from at least 8 localities in this region. |
| ⓘ 'Feldspar Group var. Perthite' |
ⓘ 'Fergusonite'Localities: Tomboarivo pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarAmbatofotsikely pegmatite, Betsohana, Mandoto, Vakinankaratra, MadagascarAmbohimasina, Betafo District, Vakinankaratra, MadagascarAmbatovohangy pegmatite, Vinaninony Atsimo, Faratsiho, Vakinankaratra, Madagascar |
| ⓘ Fergusonite-(Y) Formula: YNbO4 Localities: Faratsiho, Vakinankaratra, MadagascarIlontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAmbalabe pegmatite, Manapa pegmatite Field, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarBetafo District, Vakinankaratra, Madagascar |
| ⓘ Fersmite Formula: CaNb2O6 |
| ⓘ Feruvite ? Formula: CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) Description: No published analysis or other information. Samples visually identical to samples sold as feruvite in mineral shows has showed to be dravite.(K.E.Larsen commment des 2011) |
| ⓘ Fluorapatite Formula: Ca5(PO4)3F Localities: Ilontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarVohidahy, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Fluorapatite var. Manganese-bearing Fluorapatite Formula: (Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH) Localities: Antsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarVohidahy, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarIlontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar Colour: blue; Prusse blue Description: A. Lacroix (1912) suggest that the blue tourmaline mentioned by Duparc et al(1910) is a misnomer for "manganapatite" which occured abundantly at the locality. |
| ⓘ Fluor-dravite Formula: NaMg3Al6(Si6O18)(BO3)3(OH)3F References: Gadas, P., Novák, M., Vašinová Galiová, M., Pezzotta, F. (2023) Chemical composition of tourmalines from the Manjaka pegmatite and its exocontact, Sahatany Valley, Madagascar. Journal of Geosciences, 68 (3) 185-202 doi:10.3190/jgeosci.374 |
| ⓘ Fluor-elbaite Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F Localities: Tsarafara Nord (Ambalaroy), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar Description: dark blue Fe-rich fluor-elbaite |
| ⓘ Fluorite Formula: CaF2 Habit: massive |
| ⓘ Fluor-liddicoatite (TL) Formula: Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F Localities: Near Antsirabe, Vakinankaratra, MadagascarTsarafara Nord (Ambalaroy), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarEstatoby (Antanetinilapa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarTsarafara Sud (Ankadilava), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Fluor-uvite Formula: CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F References: Gadas, P., Novák, M., Vašinová Galiová, M., Pezzotta, F. (2023) Chemical composition of tourmalines from the Manjaka pegmatite and its exocontact, Sahatany Valley, Madagascar. Journal of Geosciences, 68 (3) 185-202 doi:10.3190/jgeosci.374 |
| ⓘ 'Fluor-uvite-Uvite Series' Colour: green Description: Found in the Marirana South pegmatite. One small fragment of green tourmaline was analyzed by (Ranorosoa 1986) and found to be an uvite |
| ⓘ Forsterite Formula: Mg2(SiO4) |
| ⓘ Gahnite Formula: ZnAl2O4 |
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 Localities: Reported from at least 6 localities in this region. |
| ⓘ Gedrite Formula: ◻Mg2(Mg3Al2)(Al2Si6O22)(OH)2 Habit: masses of laminary, fibrous crystals Colour: Brownish |
| ⓘ Gibbsite Formula: Al(OH)3 |
| ⓘ Goethite Formula: Fe3+O(OH) Localities: Reported from at least 9 localities in this region. |
| ⓘ Goyazite Formula: SrAl3(PO4)(PO3OH)(OH)6 |
| ⓘ Graphite Formula: C Localities: Ambohitrakanga, Ramainandro, Faratsiho, Vakinankaratra, MadagascarSarobaratra, Ambatomiady, Antanifotsy District, Vakinankaratra, MadagascarItrafo, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Grossular Formula: Ca3Al2(SiO4)3 Localities: Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmbatondragaby skarn outcrops, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, MadagascarItrafo, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, MadagascarMaharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar ? (more information) |
| ⓘ Grossular var. Tsavorite Formula: Ca3Al2(SiO4)3 |
| ⓘ Hambergite Formula: Be2(BO3)(OH) Localities: Reported from at least 8 localities in this region. Description: A. Lacroix (1912) mentions a single crystal that measured 9 x 5,5 x 3 cm |
| ⓘ Hastingsite Formula: NaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2 |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ 'Hornblende Root Name Group' Formula: ◻Ca2(C2+4C3+)(AlSi7O22)W2 |
| ⓘ 'Humite Group' |
| ⓘ Hübnerite Formula: MnWO4 Localities: Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarIlontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ 'Ilmenorutile-Strüverite Series' |
ⓘ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'Localities: Ilapa, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarIlontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarVohidahy, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarNear Antsirabe, Vakinankaratra, Madagascar |
| ⓘ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series var. Scandium-bearing Ixiolite (of von Knorring)' (FRL) Formula: (Nb,Ta,Ti,Sc,Fe,Mn)4O8 Type Locality: |
| ⓘ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series var. Wolframoixiolite' Formula: (Nb,W,Ta,Fe,Mn)2O4 Localities: Ilontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Kaolinite Formula: Al2(Si2O5)(OH)4 Localities: Ampangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, MadagascarAntsofimbato pegmatites, Mangarano, Antsirabe II District, Vakinankaratra, MadagascarVavatany pegmatites, Mangarano, Antsirabe II District, Vakinankaratra, MadagascarAndrianampy, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarTetezantsio pegmatites, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, Madagascar ? (more information) |
| ⓘ 'K Feldspar' |
| ⓘ 'K Feldspar var. Adularia' Formula: KAlSi3O8 |
| ⓘ Kyanite Formula: Al2(SiO4)O |
| ⓘ Lazulite Formula: MgAl2(PO4)2(OH)2 Localities: Mount Ibity (Mt Bity), Ibity, Antsirabe II District, Vakinankaratra, MadagascarIbity massif, Ibity, Antsirabe II District, Vakinankaratra, MadagascarRanomainty, Manandona, Antsirabe II District, Vakinankaratra, MadagascarBetafo District, Vakinankaratra, MadagascarAnalambano, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ 'Lepidolite' |
| ⓘ Liddicoatite Formula: Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) Localities: Reported from at least 8 localities in this region. Colour: green Description: Determined from a green zone inside a pink elbaite (Ranorosoa 1986) |
| ⓘ 'Limonite' |
| ⓘ Lithiophilite Formula: LiMn2+PO4 Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarTsarafara Sud (Ankadilava), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar ? (more information) Description: Pink, translucent, prismatic crystals (rare) or masses in albite.
Often with an aureole of manganese oxides. |
| ⓘ Londonite Formula: CsBe4Al4(B11Be)O28 Localities: Reported from at least 6 localities in this region. Habit: Up to 7 cm large crystals formed by dodecahedra {110} modified by deltoid dodecahedral{221}, tristetrahedral{211} and tetrahedral faces {111} Colour: white to sulfur yellow |
| ⓘ 'Londonite-Rhodizite Series' Habit: Forms: Dodecahedral {110} faces modified by deltoid dodecahedral {221}, tristetrahedral {211}, and tetrahedral {111} faces, rarely cubic {100} faces. Colour: Pale yellowish greenish Description: Specimens of rhodizite/londonite, when not individually determined chemically from this locality should be designed londonite-rhodizite series. Crystal up to 10 cm across found frozen in pegmatite matrix, in the more chemical evolved portions of the dikes charcateized by green and red tourmaline |
| ⓘ Magnesio-lucchesiite Formula: CaMg3Al6(Si6O18)(BO3)3(OH)3O References: Gadas, P., Novák, M., Vašinová Galiová, M., Pezzotta, F. (2023) Chemical composition of tourmalines from the Manjaka pegmatite and its exocontact, Sahatany Valley, Madagascar. Journal of Geosciences, 68 (3) 185-202 doi:10.3190/jgeosci.374 |
| ⓘ Magnesiotaaffeite-2N’2S Formula: Mg3Al8BeO16 Habit: colourless grains |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Manandonite Formula: Li2Al4(Si2AlB)O10(OH)8 Localities: Marirana Pegmatites (Andasy), Marirana, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar Description: Found between lamelles of cleavelandite at Marirana North |
| ⓘ Marcasite Formula: FeS2 Localities: Vatovory (Vinaninkarena Uranium deposit), Anjanamanjaka, Vinaninkarena, Antsirabe II District, Vakinankaratra, MadagascarAmbano, Ambano Commune, Antsirabe II District, Vakinankaratra, MadagascarAntsirabe I District, Vakinankaratra, Madagascar |
| ⓘ Meionite Formula: Ca4Al6Si6O24CO3 References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ 'Mica Group' |
| ⓘ Microcline Formula: K(AlSi3O8) Habit: pink or white Description: pink or white |
| ⓘ Microcline var. Amazonite Formula: K(AlSi3O8) |
| ⓘ 'Microlite Group' Formula: A2-mTa2X6-wZ1-n Description: U-rich variety |
| ⓘ Mirabilite Formula: Na2SO4 · 10H2O |
| ⓘ Molybdenite Formula: MoS2 Localities: Faratsiho, Vakinankaratra, MadagascarAmpangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, MadagascarTsaramanga pegmatite, Mahaiza, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Monazite-(Ce) Formula: Ce(PO4) |
| ⓘ 'Monazite Group' Formula: REE(PO4) |
| ⓘ Montmorillonite Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O Localities: Antsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarMaharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar Description: Maybe a pseudomorph ? after another mineral. |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Damourite Formula: KAl2(AlSi3O10)(OH)2 Habit: massive Colour: light greenish |
| ⓘ Muscovite var. Fuchsite Formula: K(Al,Cr)3Si3O10(OH)2 |
| ⓘ Muscovite var. Gilbertite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Native Bismuth Formula: Bi |
| ⓘ Native Gold Formula: Au Localities: Reported from at least 7 localities in this region. |
| ⓘ Native Sulphur Formula: S8 |
| ⓘ Nioboixiolite-(Mn2+) Formula: (Nb0.67Mn2+0.33)O2 |
| ⓘ Opal Formula: SiO2 · nH2O Localities: Reported from at least 6 localities in this region. |
| ⓘ Opal var. Opal-AN Formula: SiO2 · nH2O |
| ⓘ Orthoclase Formula: K(AlSi3O8) Localities: Tetezantsio pegmatites, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmpanodiana South pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, Madagascar |
ⓘ 'Orthopyroxene Subgroup'References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Oxy-dravite Formula: Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O References: Gadas, P., Novák, M., Vašinová Galiová, M., Pezzotta, F. (2023) Chemical composition of tourmalines from the Manjaka pegmatite and its exocontact, Sahatany Valley, Madagascar. Journal of Geosciences, 68 (3) 185-202 doi:10.3190/jgeosci.374 |
ⓘ PalygorskiteFormula: ◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O |
| ⓘ Pargasite Formula: NaCa2(Mg4Al)(Si6Al2)O22(OH)2 References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Pezzottaite-(Cs) Formula: Cs(Be2Li)Al2(Si6O18) Localities: Tompoambohitra (Tokambohitra), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Phenakite Formula: Be2SiO4 Localities: Reported from at least 6 localities in this region. Description: Wilson (1984) mentions a find of a pocket with danburite and phenakite. About 50 crystals of clear, colorless, prismatic phenakite from 5mm wide and, 15 cm long to 2,5 cm wide and 8 cm long were mined. |
| ⓘ Phlogopite Formula: KMg3(AlSi3O10)(OH)2 Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarSoamiakatra, Ambohitsimanova, Antsirabe II District, Vakinankaratra, MadagascarItrafo, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar Description: A Di+Tr+Tur±Kfs±Qz±Cs-rich phlogopite in variable proportions are found in small bands in the exocontact of the pegmatite with the host rock. |
| ⓘ Phosphuranylite Formula: KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 Localities: Soamiakatra, Ambohitsimanova, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, MadagascarMt Tsiafajavona, Tsiafajavona Ankaratra, Ambatolampy District, Vakinankaratra, Madagascar |
| ⓘ Pollucite Formula: (Cs,Na)2(Al2Si4O12) · 2H2O Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarTetezantsio pegmatites, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, MadagascarTompoambohitra (Tokambohitra), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar ? (more information)Ilontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar ? (more information) Description: corroded |
| ⓘ 'Psilomelane' |
| ⓘ Pucherite Formula: Bi(VO4) Localities: Tsilaizina pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarAmbatomalaza (Vohimasina), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAmpangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, MadagascarTsaramanga pegmatite, Mahaiza, Betafo District, Vakinankaratra, MadagascarSamiresy, Tritriva, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Pyrite Formula: FeS2 Localities: Marobiby, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarAntemotra quarry, Ambalavao, Ibity, Antsirabe II District, Vakinankaratra, MadagascarItrafo, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmpangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, Madagascar |
| ⓘ 'Pyrochlore Group' Formula: A2Nb2(O,OH)6Z Localities: Reported from at least 6 localities in this region. Colour: dark brown Description: SEM analysis : Nb2O5: 28,06; Ta2O5: 43,45; TiO2: 8,41; CaO: 2.44; UO2: 17.64. |
| ⓘ 'Pyrochlore Group var. Samiresite' Formula: (U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F) |
| ⓘ 'Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977)' Formula: (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) Localities: Betafo District, Vakinankaratra, MadagascarSamiresy, Tritriva, Betafo District, Vakinankaratra, MadagascarEstatoby (Antanetinilapa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarFefena pegmatite, Betafo District, Vakinankaratra, Madagascar |
| ⓘ 'Pyrochlore Supergroup' Formula: A2-mD2X6-wZ1-n |
| ⓘ 'Pyrochlore Supergroup var. Betafite (of Hogarth 1977)' (FRL) Formula: (Ca,Na,U)2(Ti, Nb,Ta)2O6Z(OH) Habit: masses ; octaedres |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Pyromorphite Formula: Pb5(PO4)3Cl |
| ⓘ Pyrope Formula: Mg3Al2(SiO4)3 References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ 'Pyroxene Group var. Al-pyroxene' Formula: M2M1(Si1.5Al0.5)O6 References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Amethyst Formula: SiO2 |
| ⓘ Quartz var. Chalcedony Formula: SiO2 Localities: Ankarinarivo pegmatite, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarFitamalama, Ambatonikolahy, Betafo District, Vakinankaratra, MadagascarTsarahonenana Massif, Tsarahonenana Sahanivotry, Antsirabe II District, Vakinankaratra, Madagascar Description: Lacroix (1912) uses the name Tompobohitra for the locality. This is most probably todays Ankarinarivo (cfr also Rakotoarison 1964) |
| ⓘ Quartz var. Citrine Formula: SiO2 Localities: Tsarafara Sud (Ankadilava), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarEstatoby (Antanetinilapa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarBevitsika Massif, Anjoma Ramartina, Mandoto, Vakinankaratra, MadagascarVohitrakanga pegmatite, Andrembesoa, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Quartz var. Pseudocubic Quartz Formula: SiO2 |
| ⓘ Quartz var. Rock Crystal Formula: SiO2 Localities: Maharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarTsarafara Nord (Ambalaroy), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarItetehana, Mangarano, Antsirabe II District, Vakinankaratra, MadagascarAmpatsikahitra pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Quartz var. Rose Quartz Formula: SiO2 |
| ⓘ Quartz var. Rutilated Quartz Formula: SiO2 Description: Known locally as "cheveux de Venus" (hair of Venus) |
| ⓘ Quartz var. Sceptre Quartz Formula: SiO2 |
| ⓘ Quartz var. Smoky Quartz Formula: SiO2 |
| ⓘ Rhodizite Formula: KBe4Al4(B11Be)O28 Localities: Reported from at least 7 localities in this region. Habit: Up to 2 cm large well developed dodecahedral crystals modified by tetrahedron {111} faces Colour: Pale to honey yellow; colorless. Transparent to translucent Description: Occurs in saccharoidal albite close to the contact with the hosting marble, and in miarolitic cavities. |
| ⓘ Rhodochrosite Formula: MnCO3 Description: Anhedral grains of pink lithiophilite may locally been replaced by rhodochrosite. References: Novák, Milan, Cempírek, Jan, Gadas, Petr, Škoda, Radek, Vašinová Galiová, Michaela, Pezzotta, Federico, Groat, Lee A. (2015) Boralsilite and Li, Be-bearing "Boron Mullite" Al8B2Si2O19, Breakdown products of spodumene from the Manjaka pegmatite, Sahatany valley, Madagascar. The Canadian Mineralogist, 53 (2) 357-374 doi:10.3749/canmin.1400092 |
| ⓘ Rossmanite Formula: ◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ Rutile Formula: TiO2 Description: Rutilated crystals as inclusions in quartz ( "cheveux de Venus" (Hair of Venus)) |
| ⓘ Rutile var. Ilmenorutile Formula: (Ti,Nb)O2 Localities: Reported from at least 9 localities in this region. |
| ⓘ Rutile var. Niobium-bearing Rutile Formula: (Ti,Nb)O2 Description: Found in small bands at the exocontact of the pegmatite with the host rock. References: Novák, M., Gadas, P., Galiová Vašínová, M., and Pezzotta, F. (2013) Compositional variations in Cs,Li,Mg-rich beryl from exocontact of the complex Manjaka pegmatite, Sahatany Valley, Madagascar. GAG-MAC Winnipeg 2013, SY2-P3, 152-153. |
| ⓘ Rutile var. Strüverite Formula: (Ti,Ta,Fe)O2 Localities: Reported from at least 6 localities in this region. |
| ⓘ Rynersonite Formula: CaTa2O6 Localities: Ampanodiana North pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, MadagascarTetezantsio pegmatites, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmpanodiana South pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Samarskite-(Y) Formula: YFe3+Nb2O8 |
| ⓘ Sanidine Formula: K(AlSi3O8) |
| ⓘ Sapphirine Formula: Mg4(Mg3Al9)O4[Si3Al9O36] References: Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
ⓘ 'Scapolite'Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsirabe II District, Vakinankaratra, MadagascarSoamiakatra, Ambohitsimanova, Antsirabe II District, Vakinankaratra, Madagascar Description: Found in small bands at the exocontact of the pegmatite with the host rock. |
| ⓘ 'Scapolite var. Wernerite' |
| ⓘ Schiavinatoite (TL) Formula: Nb(BO4) Localities: Antsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarAmpanodiana North pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmpanodiana South pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, Madagascar Habit: as cryptocrystalline portions in behierite |
| ⓘ Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ Sillimanite Formula: Al2(SiO4)O Localities: Sillimanite occurrence, Manandona, Antsirabe II District, Vakinankaratra, MadagascarAnjoma Ramartina, Mandoto, Vakinankaratra, MadagascarAnjomakely, Antsirabe II District, Vakinankaratra, MadagascarSarobaratra, Ambatomiady, Antanifotsy District, Vakinankaratra, Madagascar |
| ⓘ Spessartine Formula: Mn2+3Al2(SiO4)3 |
| ⓘ Spinel Formula: MgAl2O4 Localities: Reported from at least 9 localities in this region. |
| ⓘ Spinel var. Ferropicotite Formula: (Mg,Fe)Al2O4 |
| ⓘ Spodumene Formula: LiAlSi2O6 |
| ⓘ Spodumene var. Hiddenite Formula: LiAlSi2O6 |
| ⓘ Spodumene var. Kunzite Formula: LiAlSi2O6 Localities: Maharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAnjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, MadagascarAmbatonivarina, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAmpatsikahitra pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Staurolite Formula: Fe2+2Al9Si4O23(OH) |
| ⓘ Stibiotantalite Formula: Sb3+TaO4 Localities: Ampanodiana South pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, MadagascarAmpanodiana North pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, Madagascar Description: As alteration of behierite-schiavinatoite crystals |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 Localities: Ibity massif, Ibity, Antsirabe II District, Vakinankaratra, MadagascarSahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarFitamalama, Ambatonikolahy, Betafo District, Vakinankaratra, Madagascar |
| ⓘ Talc var. Steatite Formula: Mg3(Si4O10)(OH)2 |
| ⓘ Tantalite-(Mn) Formula: Mn2+Ta2O6 Localities: Antsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarAntsahanana quarry, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarIlontsa (Ilotsa), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Thermonatrite Formula: Na2CO3 · H2O |
| ⓘ 'Thomsonite Subgroup' |
| ⓘ Thorite Formula: Th(SiO4) Localities: Ambohimasina, Betafo District, Vakinankaratra, MadagascarTomboarivo pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarMahatsinjo, Vinaninony Atsimo, Faratsiho, Vakinankaratra, Madagascar |
| ⓘ Thorite var. Orangite Formula: Th(SiO4) Localities: Ambohimasina, Betafo District, Vakinankaratra, MadagascarMahatsinjo, Vinaninony Atsimo, Faratsiho, Vakinankaratra, MadagascarTomboarivo pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Titanite Formula: CaTiO(SiO4) Localities: Tomboarivo pegmatite, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarMananjara, Sahanivotry Manandona, Antsirabe II District, Vakinankaratra, MadagascarManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarMandro, Betafo District, Vakinankaratra, MadagascarAmbalamafana, Mangarano, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Topaz Formula: Al2(SiO4)(F,OH)2 |
| ⓘ Touretite (TL) Formula: LiAl4Be4(B11Be)O28 Type Locality: References: Hatert, F., Pezzotta, F., Vignola, P., Wälle, M., Lefèvre, P., Škoda, R., Kasatkin, A. V., Agakhanov, A. A., Zubkova, N. V., Bonazzi, M., Zanetti, A., Rotiroti, N., Risplendente, A., Depret, M., and Bomal, F.: Touretite, IMA 2023-003a, in: CNMNC Newsletter 80, Eur. J. Mineral., 36, https://doi.org/10.5194/ejm-36-599-2024, 2024. Hatert, Frédéric; Depret, Martin; Bomal, Florent; Pezzotta, Federico; Vignola, Pietro; Wälle, Markus; Lefèvre, Pierre; Škoda, Radek; Kasatkin, Anatoly V.; Agakhanov, Atali A.; et al. (2025) Touretite, LiAl4Be4(B11Be)O28, A New Borate Mineral from the Ambalabe Pegmatite, Madagascar. The Canadian Journal of Mineralogy and Petrology. doi:10.3749/250007 |
| ⓘ 'Tourmaline' Formula: AD3G6(T6O18)(BO3)3X3Z |
| ⓘ 'Tourmaline var. Achroite' |
| ⓘ 'Tourmaline var. Rubellite' |
ⓘ 'Tourmaline var. Verdelite'Localities: Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarTsarafara Sud (Ankadilava), Tsarafara Pegmatites, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ 'Tourmaline var. Watermelon Tourmaline' |
| ⓘ Tremolite Formula: ◻Ca2Mg5(Si8O22)(OH)2 Localities: Manjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarSahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarMaharitra, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsirabe II District, Vakinankaratra, MadagascarIbity massif, Ibity, Antsirabe II District, Vakinankaratra, Madagascar Description: Found in the exocontact zones of the pegmatite |
| ⓘ Tridymite Formula: SiO2 |
| ⓘ Trolleite Formula: Al4(PO4)3(OH)3 |
| ⓘ Uranocircite Formula: Ba(UO2)2(PO4)2 · 10H2O |
| ⓘ Uvite Formula: CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) References: Gadas, P., Novák, M., Vašinová Galiová, M., Pezzotta, F. (2023) Chemical composition of tourmalines from the Manjaka pegmatite and its exocontact, Sahatany Valley, Madagascar. Journal of Geosciences, 68 (3) 185-202 doi:10.3190/jgeosci.374 |
| ⓘ Vermiculite Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| ⓘ Vesuvianite Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| ⓘ Vigezzite ? Formula: CaNb2O6 Description: As alteration of behierite-schiavinatoite crystals |
| ⓘ Vivianite Formula: Fe2+Fe2+2(PO4)2 · 8H2O |
| ⓘ Vránaite (TL) Formula: Al16B4Si4O38 Type Locality: Habit: As aggregates of subparallel prisms up to 100 μm long. Description: Occurs as a breakdown product of spodumene. References: Cempírek, Jan, Grew, Edward S., Kampf, Anthony R., Ma, Chi, Novák, Milan, Gadas, Petr, Škoda, Radek, Vašinová-Galiová, Michaela, Pezzotta, Federico, Groat, Lee A., Krivovichev, Sergey V. (2016) Vránaite, ideally Al16B4Si4O38, a new mineral related to boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar. American Mineralogist, 101 (9) 2108-2117 doi:10.2138/am-2016-5686 |
| ⓘ Wavellite Formula: Al3(PO4)2(OH)3 · 5H2O |
| ⓘ Wollastonite Formula: Ca3(Si3O9) Localities: Wollastonite occurrence, Ambalavao, Ibity, Antsirabe II District, Vakinankaratra, MadagascarVakinankaratra, MadagascarWollastonite occurrence, Marirana, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, MadagascarAntsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Xenotime-(Y) Formula: Y(PO4) |
ⓘ 'Zinnwaldite'Localities: Anjanabonoina pegmatites, Ambohimanambola, Betafo District, Vakinankaratra, MadagascarAntaboaka North, Mangarano, Antsirabe II District, Vakinankaratra, MadagascarAntsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, MadagascarAnkarinarivo pegmatite, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar |
| ⓘ Zircon Formula: Zr(SiO4) |
| ⓘ Zircon var. Cyrtolite Formula: Zr[(SiO4),(OH)4] Description: Cyrtolite mentioned as a associated mineral to "blomstrandite" in Lacroix (1912), but described as malacon later in Lacroix 1922 |
| ⓘ Zircon var. Hafnian Zircon Formula: (Zr,Hf)SiO4 |
| ⓘ Zircon var. Malacon Formula: Zr(SiO4) |
| ⓘ Zoisite Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
Mount Ibity, Ibity, Antsirabe II District, Vakinankaratra, Madagascar