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 |  Radioactive |
| 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[edit]
It was first described in 1982 from the Margaritas uranium deposit in the Peña Blanca district of the municipality of Aldama, in the Mexican state of Chihuahua.
See also[edit]
References[edit]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ 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