Margaritasite
Margaritasite | |
---|---|
General | |
Category | Carnotite group |
Formula (repeating unit) | (Cs, K, H3O)2(UO2)2V2O8·H2O |
IMA symbol | Mgt[1] |
Strunz classification | 7/E.11-60 |
Dana classification | 40.2a.28.2 |
Crystal system | Monoclinic |
Crystal class | 2/m - Prismatic |
Space group | P21/a (no. 14) |
Unit cell | a = 10.514(3) Å, b = 8.425(3) Å, c = 7.252(5) Å β = 106.01° |
Identification | |
Color | Yellow |
Crystal habit | Tabular crystals, typically massive |
Diaphaneity | Translucent |
Specific gravity | 5.41 |
Optical properties | Biaxial (-) α = [< 1.83] (synthetic). β = 2.49(1) γ = > 2.7 |
2V angle | 45.5◦ |
Other characteristics | ![]() |
References | [2][3][4] |
Margaritasite is a yellow, caesium-bearing mineral in the carnotite group. Its chemical formula is (Cs, K, H3O)2(UO2)2V2O8·H2O and its crystal system is monoclinic (space group P21/a[3]).
Name and discovery[]
It was first described in 1982 from the Margaritas uranium deposit in the district of the municipality of Aldama, in the Mexican state of Chihuahua.
See also[]
References[]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
- ^ Mindat.org - Margaritasite
- ^ a b Appleman, D.E.; Evans, H.T. (1965). "The crystal structures of synthetic anhydrous carnotite, K2(UO2)2V2O8, and its cesium analogue, Cs2(UO2)2V2O8". American Mineralogist. 50: 825–842. Retrieved 30 December 2020.
- ^ Handbook of Mineralogy - Margaritasite
Categories:
- Vanadate minerals
- Caesium minerals
- Potassium minerals
- Uranium(VI) minerals
- Monoclinic minerals
- Minerals in space group 14
- Oxide mineral stubs
- Oxide minerals