Log In
Dargaite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Dargaite
Nahal Darga, Palestine
Formula:
BaCa12(SiO4)4(SO4)2O3
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
3.235 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Named for the type locality Canyon (Nahal) Darga.
Type Locality:
The F-deficient Ba analogue of nabimusaite. Chemically similar to gazeevite and wenkite.
Spatially related (coexisting) with nabimusaite and gazeevite.
Holotype specimen assemblage: larnite, fluorellestadite–fluorapatite, brownmillerite, fluormayenite–fluorkyuygenite, ye'elimite; also ternesite, shulamitite and periclase.
Formed via interaction of former pyrometamorphic assemblages with hot gases, fluids and melts, at ~900°C.
Spatially related (coexisting) with nabimusaite and gazeevite.
Holotype specimen assemblage: larnite, fluorellestadite–fluorapatite, brownmillerite, fluormayenite–fluorkyuygenite, ye'elimite; also ternesite, shulamitite and periclase.
Formed via interaction of former pyrometamorphic assemblages with hot gases, fluids and melts, at ~900°C.
Unique Identifiers
Mindat ID:
46885
Long-form identifier:
mindat:1:1:46885:7
IMA Classification of Dargaite
Approved
IMA Formula:
BaCa12(SiO4)4(S6+O4)2O3
Approval year:
2015
First published:
2019
Type description reference:
Galuskina, Irina O., Gfeller, Frank, Galuskin, Evgeny V., Armbruster, Thomas, Vapnik, Yevgeny, Dulski, Mateusz, Gardocki, Mariusz, Jeżak, Lidia, Murashko, Mikhail (2019) New minerals with modular structure derived from hatrurite from the pyrometamorphic rocks. Part IV: Dargaite, BaCa12(SiO4)4(SO4)2O3, from Nahal Darga, Palestinian Autonomy. Mineralogical Magazine, 83 (1) 81-88 doi:10.1180/minmag.2017.081.095
Classification of Dargaite
9.AH.35
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Drg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Dargaite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Hardness:
VHN50=380 - 492 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
(001)
(001)
Parting:
pronounced
Density:
3.235 g/cm3 (Calculated)
Comment:
could not be measured due to inclusions
Optical Data of Dargaite
Type:
Uniaxial (-)
RI values:
nω = 1.643(3) nε = 1.639(3)
Max. Birefringence:
δ = 0.004
Based on recorded range of RI values above.
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.
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:
Moderate
Pleochroism:
Non-pleochroic
Chemistry of Dargaite
Mindat Formula:
BaCa12(SiO4)4(SO4)2O3
Element Weights:
Crystallography of Dargaite
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 7.1874(4) Å, c = 41.292(3) Å
Ratio:
a:c = 1 : 5.745
Unit Cell V:
1847.32 ų
Z:
3
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.103 Å | (100) |
| 2.753 Å | (95) |
| 2.750 Å | (88) |
| 2.665 Å | (63) |
| 2.141 Å | (43) |
| 1.987 Å | (35) |
| 1.797 Å | (62) |
| 1.539 Å | (58) |
Reference:
Galuskina, Irina O., Gfeller, Frank, Galuskin, Evgeny V., Armbruster, Thomas, Vapnik, Yevgeny, Dulski, Mateusz, Gardocki, Mariusz, Jeżak, Lidia, Murashko, Mikhail (2019) New minerals with modular structure derived from hatrurite from the pyrometamorphic rocks. Part IV: Dargaite, BaCa12(SiO4)4(SO4)2O3, from Nahal Darga, Palestinian Autonomy. Mineralogical Magazine, 83 (1) 81-88 doi:10.1180/minmag.2017.081.095
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 51 : Pyrometamorphic minerals (see also #54 and #56) | <0.36 |
Type Occurrence of Dargaite
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Leninskiy pr., 18/к2, 115162 Moscow, Russia, catalogue number 4713/2.
Geological Setting of Type Material:
pyrometamorphic rock
Associated Minerals at Type Locality:
Reference:
Galuskina, Irina O., Gfeller, Frank, Galuskin, Evgeny V., Armbruster, Thomas, Vapnik, Yevgeny, Dulski, Mateusz, Gardocki, Mariusz, Jeżak, Lidia, Murashko, Mikhail (2019) New minerals with modular structure derived from hatrurite from the pyrometamorphic rocks. Part IV: Dargaite, BaCa12(SiO4)4(SO4)2O3, from Nahal Darga, Palestinian Autonomy. Mineralogical Magazine, 83 (1) 81-88 doi:10.1180/minmag.2017.081.095
Synonyms of Dargaite
Other Language Names for Dargaite
Relationship of Dargaite to other Species
Member of:
Other Members of Arctite Group:
| Arctite | Na2Ca4(PO4)3F | Trig. 3m(32/m) : R3m |
| Ariegilatite | BaCa12(SiO4)4(PO4)2F2O | Trig. 3m(32/m) : R3m |
| Nabimusaite | KCa12(SiO4)4(SO4)2O2F | Trig. 3m(32/m) : R3m |
Forms a series with:
Related Minerals - Strunz-mindat Grouping
| 9.AH. | Fluorbritholite-(Nd) | Ca2Nd3(SiO4)3F |
| 9.AH.05 | Iimoriite-(Y) | Y2[SiO4][CO3] |
| 9.AH.10 | Tundrite-(Ce) | Na2Ce2Ti(SiO4)(CO3)2O2 |
| 9.AH.10 | Tundrite-(Nd) | Na2(Nd,Ce)2Ti(SiO4)(CO3)2O2 |
| 9.AH.15 | Galuskinite | Ca7(SiO4)3(CO3) |
| 9.AH.15 | Spurrite | Ca5(SiO4)2(CO3) |
| 9.AH.20 | Ternesite | Ca5(SiO4)2(SO4) |
| 9.AH.20 | Silicocarnotite | Ca5[(SiO4)(PO4)](PO4) |
| 9.AH.25 | Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| 9.AH.25 | Britholite-(Y) | (Y,Ca)5(SiO4)3OH |
| 9.AH.25 | Mattheddleite | Pb5(SiO4)1.5(SO4)1.5(Cl,OH) |
| 9.AH.25 | Fluorbritholite-(Ce) | (Ce,Ca)5(SiO4)3F |
| 9.AH.25 | Fluorellestadite | Ca5(SiO4)1.5(SO4)1.5F |
| 9.AH.25 | Fluorbritholite-(La) | Ca2La3(SiO4)3F |
| 9.AH.25 | Fluorbritholite-(Y) | (Y,Ca)5(SiO4)3F |
| 9.AH.25 | Hydroxylellestadite | Ca5(SiO4)1.5(SO4)1.5(OH) |
| 9.AH.25 | 'Calciobritholite' | (Ca,Y)5(SiO4,PO4)3(OH) |
| 9.AH.25 | 'Britholite-(La)' | Ca2(La,Ce,Ca)3(SiO4,PO4)3(OH,F) |
| 9.AH.25 | Tritomite-(Ce) | Ce5(SiO4,BO4)3(OH,O) |
| 9.AH.25 | Tritomite-(Y) | Y5(SiO4,BO4)3(O,OH,F) |
| 9.AH.25 | Fluorcalciobritholite | (Ca,REE)5(SiO4,PO4)3F |
| 9.AH.25 | Chlorellestadite | Ca5(SiO4)1.5(SO4)1.5Cl |
| 9.AH.35 | Nabimusaite | KCa12(SiO4)4(SO4)2O2F |
| 9.AH.40 | Stracherite | BaCa6(SiO4)2[(PO4)(CO3)]F |
| 9.AH.40 | Zadovite | BaCa6[(SiO4)(PO4)](PO4)2F |
| 9.AH.40 | Gazeevite | BaCa6(SiO4)2(SO4)2O |
| 9.AH.45 | Flamite | Ca8-x(Na,K)x(SiO4)4-x(PO4)x |
| 9.AH.50 | Byzantievite | Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5 |
| 9.AH.55 | Greenwoodite | (Ba,V3+O)2V3+9(Fe3+,Fe2+)2Si2O22 |
| 9.AH.60 | Kihlmanite-(Ce) | Ce2TiO2(SiO4)(HCO3)2(H2O) |
| 9.AH.65 | Tsangpoite | Ca5(PO4)2(SiO4) |
| 9.AH.70 | 'Enalite' | (Th,REE,Al) [(PO4),(SiO4),(OH)] |
Fluorescence of Dargaite
none
Other Information
Notes:
Raman bands [cm-1]: 122, 263, 323, 464, 523, 563, 641 and 644, 829 and 869, 947, 991 and 1116
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 Dargaite
mindat.org URL:
https://www.mindat.org/min-46885.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Dargaite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter no 28. Mineralogical Magazine, 79 (7) 1859-1864 doi:10.1180/minmag.2015.079.7.18
Galuskina, Irina O., Gfeller, Frank, Galuskin, Evgeny V., Armbruster, Thomas, Vapnik, Yevgeny, Dulski, Mateusz, Gardocki, Mariusz, Jeżak, Lidia, Murashko, Mikhail (2019) New minerals with modular structure derived from hatrurite from the pyrometamorphic rocks. Part IV: Dargaite, BaCa12(SiO4)4(SO4)2O3, from Nahal Darga, Palestinian Autonomy. Mineralogical Magazine, 83 (1) 81-88 doi:10.1180/minmag.2017.081.095
Localities for Dargaite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Palestine (TL) | |
| Galuskina et al. (2019) |
Quick NavTopAbout DargaiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Nahal Darga, Bethlehem Governorate, West Bank, Palestine