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Dargaite

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Formula:
BaCa12(SiO4)4(SO4)2O3
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
3.235 (Calculated)
Crystal System:
Trigonal
The F-deficient Ba analogue of nabimusaite. Chemically similar to gazeeveite and wenkite.


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Classification of DargaiteHide

Approved, Pending publication
Approval Year:
2015

Physical Properties of DargaiteHide

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() 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

Chemical Properties of DargaiteHide

Formula:
BaCa12(SiO4)4(SO4)2O3

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:
1,847.31 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.103(100)
2.753(95)
2.750(88)
2.665(63)
2.141(43)
1.987(35)
1.797(62)
1.539(58)

Occurrences of DargaiteHide

Paragenetic Mode(s):

Type Occurrence of DargaiteHide

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:

Synonyms of DargaiteHide

Relationship of Dargaite to other SpeciesHide

Other Members of this group:
AriegilatiteBaCa12(SiO4)4(PO4)2F2OTrig. 3m (3 2/m) : R3m
NabimusaiteKCa12(SiO4)4(SO4)2O2FTrig. 3m (3 2/m)
Forms a series with:

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.

References for DargaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gfeller, F., Galuskina, I.O., Galuskin, E.V., Armbruster, T., Vapnik, Y., Dulski, M., Gardocki, M., Jeżak, L. and Murashko, M. (2015) Dargaite, IMA2015-068. CNMNC Newsletter No. 28, December 2015, page 1860; Mineralogical Magazine, 79, 1859–1864.
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.

Internet Links for DargaiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Palestine (TL)
 
  • West Bank
Gfeller, F., Galuskina, I.O., Galuskin, E.V., Armbruster, T., Vapnik, Y., Dulski, M., Gardocki, M., Jeżak, L. and Murashko, M. (2015) Dargaite, IMA2015-068. CNMNC Newsletter No. 28, December 2015, page 1860; Mineralogical Magazine, 79, 1859–1864.
Mineral and/or Locality  
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