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Mineralpedia Details for Margaritasite

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Margaritasite

Margaritasite

Named for the co-type localities of the mineral at the Margaritas No. 1 and Margaritas No. 2 mines in Chihuahua, Mexico. The Margaritas mines are the only locality for Margaritasite and it occurs there as filling pores and casts of phenocrysts in felsic volcanic tuffs that have been altered by hot hydrothermal fluids. Margaritasite is strongly radioactive.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/margaritasite.pdf

Formula
Cs2(UO2)2(VO4)2┬ĚH2
Crystal System
Monoclinic 
Color
yellow 
Streak
light yellow 
Class
Monoclinic - Prismatic 
Hardness
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Mindat
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Margaritasite from Margaritas mine, Sierra Peña Blanca, Chihuahua, Mexico

Margaritasite
            from Margaritas mine, Sierra Peña Blanca, Chihuahua, Mexico

Tiny bright, gold finch yellow crystals to about 0.75mm.

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