carnotite

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carnotite Mineral K2(UO2)2(VO4)2.1–3H2O; sp. gr. 4.5; hardness 2.0–2.5; monoclinic; normally bright yellow to greenish-yellow; pearly lustre; cleavage perfect, basal hardness; strongly radioactive; occurs in the weathered zone of sedimentary uranium ores, especially in sandstones enriched with organic matter, normally as coatings and masses in rocks. It is an important ore for uranium.