Noun.  (mineralogy) A hydrous potassium uranium sulfate mineral with chemical formula K4(UO2)6(SO4)3(OH)10ยท4(H2O), forming yellow to reddish-brown monoclinic-prismatic crystals with perfect cleavage and formerly used in the manufacture of paint.

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This entry was last updated on RefTopia from its source on 3/20/2012.