Margaritasite

Margaritasite
General
CategoryCarnotite group
Formula
(repeating unit)		(Cs, K, H3O)2(UO2)2V2O8·H2O
IMA symbolMgt[1]
Strunz classification7/E.11-60
Dana classification40.2a.28.2
Crystal systemMonoclinic
Crystal class2/m – Prismatic
Space groupP21/a (no. 14)
Unit cella = 10.514(3) Å, b = 8.425(3) Å, c = 7.252(5) Å β = 106.01°
Identification
ColorYellow
Crystal habitTabular crystals, typically massive
DiaphaneityTranslucent
Specific gravity5.41
Optical propertiesBiaxial (−)
α = [< 1.83] (synthetic). β = 2.49(1) γ = > 2.7
2V angle45.5◦
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

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

  1. ^ 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.
  2. ^ Mindat.org – Margaritasite
  3. ^ 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.
  4. ^ "Handbook of Mineralogy – Margaritasite" (PDF). Archived from the original (PDF) on 2012-10-01. Retrieved 2013-01-25.


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