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Mineralpedia Details for Uranopilite

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Uranopilite

Uranopilite

An allusion to its felt-like appearance, Uranopilite is named for the Greek pilos, meaning “felt,” and for its uranium content. Found in several locations, Uranopilite is locally abundant as a secondary mineral formed during the acid conditions produced by the oxidation of sulfides where uraninite is present. It is also possible that Uraopilite is post-mine product. Uranopilite is strongly radioactive and will strongly fluoresce a yellow to yellow-green under short- and long-wave ultraviolet light.

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

Formula
(UO2)6SO4O2(OH)6·14H2
Crystal System
Triclinic 
Crystal Habit
Encrustations, Reniform 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
lemon, straw yellow 
Class
Triclinic - Pinacoidal 
Hardness
WebMineral
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Mindat
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Uranopilite from Apex mine, Lander Co., Nevada, United States

Uranopilite
            from Apex mine, Lander Co., Nevada, United States
Special Info
EDS confirmed, Radioactive!

Flat lying sprays are to about 1mm.

Bright yellow powdery coatings.

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