Margaritasite
(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 
RadioactiveReferences [2][3][4]
α = [< 1.83] (synthetic). β = 2.49(1) γ = > 2.7
RadioactiveMargaritasite 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 Peña Blanca 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 (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" (PDF). Archived from the original (PDF) on 2012-10-01. Retrieved 2013-01-25.
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