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Dargaite

A valid IMA mineral species
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00194100015809741464194.jpg
Nahal Darga, Palestine
Formula:
BaCa12(SiO4)4(SO4)2O3
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
3.235 (Calculated)
Crystal System:
Trigonal
Name:
Named for the type locality Canyon (Nahal) Darga.
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.


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Unique IdentifiersHide

Mindat ID:
46885
Long-form identifier:
mindat:1:1:46885:7
GUID
(UUID V4):
91accc50-e383-4907-bfa3-528e63e21db1

IMA Classification of DargaiteHide

Classification of DargaiteHide

Strunz-mindat (2023):
9.AH.35

9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.

Mineral SymbolsHide

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

SymbolSourceReference
DrgIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of DargaiteHide

Lustre:
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)
Parting:
pronounced
Density:
3.235 g/cm3 (Calculated)
Comment:
could not be measured due to inclusions

Optical Data of DargaiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.643(3) nε = 1.639(3)
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemistry of DargaiteHide

Mindat Formula:
BaCa12(SiO4)4(SO4)2O3
Elements listed:
Ba, Ca, O, S, Si - search for minerals with similar chemistry

Crystallography of DargaiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
51 : Pyrometamorphic minerals (see also #54 and #56)<0.36

Type Occurrence of DargaiteHide

Type Locality:
ⓘ Nahal Darga, Bethlehem Governorate, West Bank, Palestine
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:
LarniteFluormayeniteFluorkyuygeniteFluorellestaditeFluorapatite
BrownmilleriteYe'elimiteTernesiteShulamititeGazeevite
NabimusaitePericlaseEttringiteGibbsiteBrucite
BaryteKatoiteCalciolangbeinite
Reference:
Gfeller, F., Galuskina, I.O., Galuskin, E.V., Armbruster, T., Vapnik, Y., Dulski, M., Gardocki, M., Jeżak, L., Murashko, M. (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.

Synonyms of DargaiteHide

Relationship of Dargaite to other SpeciesHide

Member of:
Arctite Group > Arctite Supergroup
Other Members of this group:
ArctiteNa2Ca4(PO4)3FTrig. 3m (3 2/m) : R3m
AriegilatiteBaCa12(SiO4)4(PO4)2F2OTrig. 3m (3 2/m) : R3m
NabimusaiteKCa12(SiO4)4(SO4)2O2FTrig. 3m (3 2/m) : R3m
Forms a series with:
NabimusaiteNabimusaite-Dargaite Series

Related Minerals - Strunz-mindat GroupingHide

9.AH.Fluorbritholite-(Nd)Ca2Nd3(SiO4)3FHex. 6/m : P63/m
9.AH.05Iimoriite-(Y)Y2[SiO4][CO3]Tric. 1 : P1
9.AH.10Tundrite-(Ce)Na2Ce2Ti(SiO4)(CO3)2O2Tric. 1 : P1
9.AH.10Tundrite-(Nd)Na2(Nd,Ce)2Ti(SiO4)(CO3)2O2
9.AH.15SpurriteCa5(SiO4)2(CO3)Mon. 2/m : P21/b
9.AH.15GaluskiniteCa7(SiO4)3(CO3) Mon. 2/m : P21/b
9.AH.20TernesiteCa5(SiO4)2(SO4)Orth. mmm (2/m 2/m 2/m) : Pnma
9.AH.20SilicocarnotiteCa5[(SiO4)(PO4)](PO4)Orth. mmm (2/m 2/m 2/m) : Pnma
9.AH.25Britholite-(Ce)(Ce,Ca)5(SiO4)3OHHex. 6/m : P63/m
9.AH.25Britholite-(Y)(Y,Ca)5(SiO4)3OHHex. 6/m : P63/m
9.AH.25ChlorellestaditeCa5(SiO4)1.5(SO4)1.5ClHex. 6/m : P63/m
9.AH.25Fluorbritholite-(Ce)(Ce,Ca)5(SiO4)3FHex. 6/m : P63/m
9.AH.25FluorellestaditeCa5(SiO4)1.5(SO4)1.5FHex. 6/m : P63/m
9.AH.25HydroxylellestaditeCa5(SiO4)1.5(SO4)1.5(OH)Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
9.AH.25MattheddleitePb5(SiO4)1.5(SO4)1.5(Cl,OH)Hex. 6/m : P63/m
9.AH.25Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
9.AH.25Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
9.AH.25Fluorcalciobritholite(Ca,REE)5(SiO4,PO4)3FHex. 6/m : P63/m
9.AH.25Fluorbritholite-(Y)(Y,Ca)5(SiO4)3FHex. 6/m : P63/m
9.AH.25Britholite-(La)Ca2(La,Ce,Ca)3(SiO4,PO4)3(OH,F)
9.AH.25Calciobritholite(Ca,Y)5(SiO4,PO4)3(OH)
9.AH.35NabimusaiteKCa12(SiO4)4(SO4)2O2FTrig. 3m (3 2/m) : R3m
9.AH.40ZadoviteBaCa6[(SiO4)(PO4)](PO4)2FTrig. 3m : R3m
9.AH.40GazeeviteBaCa6(SiO4)2(SO4)2OTrig. 3m (3 2/m) : R3m
9.AH.40StracheriteBaCa6(SiO4)2[(PO4)(CO3)]2FTrig. 3m (3 2/m) : R3m
9.AH.45FlamiteCa8-x(Na,K)x(SiO4)4-x(PO4)xOrth. mm2
9.AH.50ByzantieviteBa5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5Trig. 3 : R3
9.AH.55Greenwoodite(Ba,V3+O)2V3+9(Fe3+,Fe2+)2Si2O22Trig. 3m (3 2/m) : P3m1
9.AH.60Kihlmanite-(Ce)Ce2TiO2(SiO4)(HCO3)2(H2O)Tric. 1 : P1
9.AH.65TsangpoiteCa5(PO4)2(SiO4)Hex.
9.AH.70Enalite(Th,REE,Al) [(PO4),(SiO4),(OH)]Tet.

Fluorescence of DargaiteHide

Other InformationHide

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 DargaiteHide

References for DargaiteHide

Reference List:
Gfeller, F., Galuskina, I.O., Galuskin, E.V., Armbruster, T., Vapnik, Y., Dulski, M., Gardocki, M., Jeżak, L., Murashko, M. (2015) Dargaite, IMA2015-068. CNMNC Newsletter No. 28, December 2015, page 1860. Mineralogical Magazine: 79: 1859–1864.
Gfeller, F., Galuskina, I.O., Galuskin, E.V., Armbruster, T., Vapnik, Y., Dulski, M., Gardocki, M., Jeżak, L., Murashko, M. (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.
Gfeller, F., Galuskina, I.O., Galuskin, E.V., Armbruster, T., Vapnik, Y., Dulski, M., Gardocki, M., Jeżak, L., Murashko, M. (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.

Localities for DargaiteHide

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.

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.
Palestine (TL)
 
  • West Bank
    • Bethlehem Governorate
Galuskina, I. O., Gfeller, F., Galuskin, E. V., Armbruster, T., Vapnik, Y., Dulski, M., ... & Murashko, M. (2018). New minerals with modular structure derived from hatrurite from the pyrometamorphic rocks, part IV: Dargaite, BaCa 12 (SiO 4) 4 (SO 4) 2 O 3, from Nahal Darga, Palestinian Autonomy. Mineralogical Magazine, 1-22.
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