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Rossmanite

A valid IMA mineral species
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00058630017271928915359.jpg
Rossmanite

Black Mountain Quarry, Rumford, Oxford County, Maine, USA
09853500017271928993736.jpg
Rossmanite, etc.

Grotta d'Oggi, San Piero in Campo, Campo nell'Elba, Livorno Province, Tuscany, Italy
07891230017271929027211.jpg
Rossmanite

Dorothy China Clay Pit, Whitemoor, St Stephen-in-Brannel, Cornwall, England, UK
00058630017271928915359.jpg
Rossmanite

Black Mountain Quarry, Rumford, Oxford County, Maine, USA
09853500017271928993736.jpg
Rossmanite, etc.

Grotta d'Oggi, San Piero in Campo, Campo nell'Elba, Livorno Province, Tuscany, Italy
07891230017271929027211.jpg
Rossmanite

Dorothy China Clay Pit, Whitemoor, St Stephen-in-Brannel, Cornwall, England, UK
00058630017271928915359.jpg
Rossmanite

Black Mountain Quarry, Rumford, Oxford County, Maine, USA
05827480017271929062913.jpg
Rossmanite, etc.

Grotta d'Oggi, San Piero in Campo, Campo nell'Elba, Livorno Province, Tuscany, Italy
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About RossmaniteHide

04643460017271929096737.jpg
George R. Rossman
Formula:
◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
Colour:
Pale-pink to colorless
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
3.00
Crystal System:
Trigonal
Name:
Named after George R. Rossman (August 3, 1944 - February 6, 2026), California Institute of Technology, Pasadena, California, USA, in recognition for his work on the spectroscopy of the tourmaline-group minerals (and many other mineral species).
Tourmaline Group. The OH analogue of fluor-rossmanite.

Vacancy-dominant member; identification only possible with quantitative chemical analysis and/or crystal-structure refinement.

Visit gemdat.org for gemological information about Rossmanite.



Unique IdentifiersHide

Mindat ID:
7275
Long-form identifier:
mindat:1:1:7275:1

Similar NamesHide

GrossmaniteA valid IMA mineral speciesCaTi3+ AlSiO6

IMA Classification of RossmaniteHide

IMA status:
Approved
IMA Formula:
◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3OH
Approval year:
1996
First published:
1998

Classification of RossmaniteHide

Strunz-mindat (2026):
9.CK.05

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.3.1.3

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference for Standard
RsmIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
RsmWhitney & Evans (2010)Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371
RsmThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of RossmaniteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of RossmaniteHide

Lustre:
Vitreous
Colour:
Pale-pink to colorless
Comment:
Colorless in thin splinters.
Streak:
White
Hardness:
7 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.00 g/cm3 (Measured)    3.06 g/cm3 (Calculated)

Optical Data of RossmaniteHide

Type:
Uniaxial (-)
RI values:
nω = 1.645 nε = 1.624
Max. Birefringence:
δ = 0.021
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic (convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis centred and vertical. The coloured rings are isochromatics, computed with the same physics as the Michel-Lévy bar above; the dark cross is the isogyre.

For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.

Chemistry of RossmaniteHide

Mindat Formula:
◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
Element Weights:
Element% weight
O53.692 %
Al23.367 %
Si18.242 %
B3.511 %
Li0.751 %
H0.437 %

Calculated from ideal end-member formula.
O
Al
Si
B
Li
H
Elements listed:
Al, B, H, Li, O, Si - search for minerals with similar chemistry

Crystallography of RossmaniteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 15.802 Å, c = 7.088 Å
Ratio:
a:c = 1 : 0.449
Unit Cell V:
1,532.78 ų (Calculated from Unit Cell)
Z:
3
Comment:
Sample from Czech Republic has: a = 15.770(2), c = 7.085(1) Å.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0003739RossmaniteErtl A, Rossman G R, Hughes J M, Prowatke S, Ludwig T (2005) Mn-bearing "oxy-rossmanite" with tetrahedrally-coordinated Al and B from Austria: Structure, chemistry, and infrared and optical spectroscopic study Reported formula: (Na.46 Ca.01) (Al2.35 Li.32 Mn2+.28 Fe2+.04 Ti4+.01) Al6 (Si5.51 Al.25 B.24) O18 (BO3)3 [(OH)2.80 O.20] [O.86 (OH).10 F.04] Tourmaline American Mineralogist 90 481-4872005Eibenstein an der Thaya, Lower Austria0293
0003738RossmaniteErtl A, Rossman G R, Hughes J M, Prowatke S, Ludwig T (2005) Mn-bearing "oxy-rossmanite" with tetrahedrally-coordinated Al and B from Austria: Structure, chemistry, and infrared and optical spectroscopic study Reported formula: (Na.46 Ca.01) (Al2.37 Li.33 Mn2+.25 Fe2+.04 Ti4+.01) Al6 (Si5.47 Al.28 B.25) O18 (BO3)3 [(OH)2.85 O.15] [O.86 (OH).10 F.04] Tourmaline American Mineralogist 90 481-4872005Eibenstein an der Thaya, Lower Austria0293
0002029RossmaniteSelway J B, Novak M, Hawthorne F C, Cerny P, Ottolini L, Kyser T K (1998) Rossmanite, _(LiAl2)Al6(Si6O18)(BO3)3(OH)4, a new alkali-deficient tourmaline: Description and crystal structure American Mineralogist 83 896-9001998Rozna, Moravia, Czech Republic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.950 Å(100)
2.552 Å(93)
1.898 Å(72)
4.181 Å(58)
2.924 Å(56)
3.434 Å(52)
2.019 Å(34)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
19 : Granitic intrusive rocks
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
26 : Hadean detrital minerals
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Stage 5: Initiation of plate tectonics<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Type Occurrence of RossmaniteHide

Type Locality:
ⓘ Rožná pegmatite (Rozna; Roschna), Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
General Appearance of Type Material:
Striated prisms up to 25 mm long and 5 mm thick, elongated along c with striations parallel to c on the prism faces.
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
Lepidolite-subtype pegmatite.
Associated Minerals at Type Locality:
'Amblygonite-Montebrasite Series''Apatite'BerylCassiteriteColumbite-(Mn)
ElbaiteLepidoliteTopaz

Synonyms of RossmaniteHide

Other Language Names for RossmaniteHide

Relationship of Rossmanite to other SpeciesHide

Member of:
Tourmaline Group
Other Members of Tourmaline:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m : R3m
BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Chromium-draviteNaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DarrellhenryiteNa(Al2Li)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
DutrowiteNa(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
ErtliteNaAl3Al6(Si4B2O18)(BO3)3(OH)3OTrig. 3m : R3m
Ferro-bosiiteNaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
FeruviteCaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Fluor-buergeriteNaFe3+3Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-rossmanite◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m(32/m) : R3m
Fluor-schorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-tsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Magnesio-dutrowiteNa(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Magnesio-lucchesiiteCaMg3Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
MaruyamaiteK(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m(32/m) : R3m
Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
PrincivalleiteNa(Mn2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
SchorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
TsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
'UM2000-64-SiO:BFeHKMg'(K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O
'UM2008-52-SiO:AlBCaFFeHLiMgNa'(Ca,Na,◻)(Al,Li,Fe,Mg)3Al6[Si6O18](BO3)3(OH,O)3(F,O)
'Unnamed (F analogue of feruvite)'CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F
'Unnamed (Mn2+-F-analogue of foitite)'◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3F ?
'Unnamed (Pb-analogue of Fluor-liddicoatite)'Pb(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
UviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Vanadio-oxy-chromium-draviteNaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Forms a series with:
ElbaiteElbaite-Rossmanite Series

Common AssociatesHide

Associations Based on Photo Data:
6 photos of Rossmanite associated with QuartzSiO2
5 photos of Rossmanite associated with Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F
5 photos of Rossmanite associated with ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
4 photos of Rossmanite associated with Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
4 photos of Rossmanite associated with Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
3 photos of Rossmanite associated with Lepidolite
2 photos of Rossmanite associated with AlbiteNa(AlSi3O8)
1 photo of Rossmanite associated with KaoliniteAl2(Si2O5)(OH)4
1 photo of Rossmanite associated with K Feldspar
1 photo of Rossmanite associated with PolylithioniteKLi2Al(Si4O10)(F,OH)2

Related Minerals - Strunz-mindat GroupingHide

9.CK.AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.Magnesio-dutrowiteNa(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.DarrellhenryiteNa(Al2Li)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Fluor-schorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.PrincivalleiteNa(Mn2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.DutrowiteNa(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Ferro-bosiiteNaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05FeruviteCaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Chromium-draviteNaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-rossmanite◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m(32/m) : R3m
9.CK.05Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-buergeriteNaFe3+3Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
9.CK.05'Unnamed (F analogue of feruvite)'CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F
9.CK.05ErtliteNaAl3Al6(Si4B2O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05TsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05UviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-tsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m(32/m) : R3m
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Vanadio-oxy-chromium-draviteNaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
9.CK.05'UM2000-64-SiO:BFeHKMg'(K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O
9.CK.05Magnesio-lucchesiiteCaMg3Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05'Luinaite-(OH)'NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
9.CK.05SchorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05MaruyamaiteK(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig. 3 : R3
9.CK.15ScawtiteCa7(Si3O9)2CO3 · 2H2OMon. 2/m : B2/m
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O
9.CK.20Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2OTrig. 3m(32/m) : R3m

Fluorescence of RossmaniteHide

In UV light:
Not fluorescent.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for RossmaniteHide

References for RossmaniteHide

Localities for RossmaniteHide

Showing 46 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • San Luis Province
    • Coronel Pringles Department
      • Estancia Grande
        • Las Águilas deposit
Galliski et al. (2012)
Brazil
 
Queiroz (2016)
  • Minas Gerais
    • Conselheiro Pena
Wilson (2012)
  • Tocantins
Coelho et al. (2025)
    • São Salvador do Tocantins
Hudson et al. (n.d.)
Canada
 
  • British Columbia
    • Revelstoke Mining Division
      • Revelstoke
Dixon (2014, October)
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
Selway et al. (2000)
    • Red Cross Lake
Selway et al. (1999) +2 other references
China
 
  • Hubei
    • Xianning
      • Tongcheng Co.
Qin et al. (2025)
  • Xinjiang
    • Ili Kazakh Autonomous Prefecture
      • Altay Prefecture (Aletai Prefecture)
        • Fuyun Co. (Koktokay Co.)
          • Koktokay pegmatite field (Keketuohai pegmatite field)
            • Altay Mine
Zhang AC et al. (2004)
Czech Republic
 
  • South Bohemian Region
    • Písek District
Historic mineral collection National ...
  • Vysočina Region
    • Třebíč District
Bull. Minéral.
    • Žďár nad Sázavou District
Novák et al. (1999)
      • Rousměrov
Selway et al. (1999)
      • Rožná
Am. Mineral. (1998) +2 other references
P. Pauliš (2001)
Germany
 
  • Saxony
    • Zwickau District
      • Limbach-Oberfrohna
        • Pegmatite occurrences
Ertl et al. (2009)
Italy
 
  • Lombardy
    • Brescia Province
      • Cevo
        • Upper Val Saviore
          • Monte Foppa (north slope)
            • Forcel Rosso Gully (Forcel Rosso Pass)
Diella et al. (2018)
  • Tuscany
    • Livorno Province
      • Campo nell'Elba
        • San Piero in Campo
Barsotti et al. (2006)
F. Pezzotta et al. (1998)
        • Sant'Ilario in Campo
Pezzotta et al. (1998)
Japan
 
  • Fukuoka Prefecture
    • Fukuoka City
Yohei Shirose and Seiichiro Uehara (2013)
Madagascar
 
  • Anosy
    • Amboasary Sud District
      • Tranomaro
Pezzotta (2004)
  • Vakinankaratra
    • Antsirabe II District
      • Ibity
        • Sahatany Valley
Buřival et al. (2015)
Mozambique
 
  • Zambezia Province
    • Alto Ligonha Pegmatite Field
      • Muva
Simmons et al. (2011)
Namibia
 
  • Erongo Region
    • Omaruru Constituency
Giller BS (2003)
Nigeria
 
  • Oyo
    • Atisbo
Giller BS (2003)
Norway
 
  • Nordland
    • Meløy
      • Holandsfjorden
Kolitsch et al. (2013)
Poland
 
  • Lower Silesian Voivodeship
    • Dzierżoniów County
      • Piława Górna
        • DSS Piława Górna Quarry
Pieczka et al. (2017) +1 other reference
Pieczka et al. (2012)
Rubio-Ordóñez et al. (2019)
Republic of the Congo
 
Russia
 
  • Primorsky Krai
    • Lesozavodsk Urban Okrug
minerals.gps.caltech.edu (n.d.)
  • Sverdlovsk Oblast
    • Rezhevsky District
      • Lipovsk pegmatite field
Memetova L.R. et al. (2005) +1 other reference
  • Zabaykalsky Krai
    • Krasnochikoysky District
      • Krasnyi Chikoy
Lees et al. (2019)
Kasatkin et al. (2024)
Sweden
 
  • Stockholm County
    • Haninge
      • Utö
        • Utö Mines
Selway et al. (2002)
Selway et al. (2002)
Tanzania
 
  • Morogoro Region
    • Morogoro Rural District
Giller BS (2003)
UK
 
  • England
    • Cornwall
      • St Stephen-in-Brannel
        • Whitemoor
Tindle (2008)
USA
 
  • Maine
    • Androscoggin County
      • Poland
Pedro-Pablo Gil-Crespo et al. (2012) +2 other references
    • Oxford County
      • Paris
minerals.gps.caltech.edu (2005) +1 other reference
      • Rumford
Dyar et al. (1998)
  • New York
    • Essex County
Lupulescu et al. (2008)
Vietnam
 
  • Yên Bái Province
    • Lục Yên District
Wilson (2007)
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