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MD-203061
Autunite
Thumbnail, 2.2 x 1.8 x 1.2 cm
Daybreak Mine (Dahl lease), Mount Kit Carson, Spokane Co., Washington, USA
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Autunite is an interesting and actually quite pretty rare uranium mineral (hydrated calcium uranyl phosphate). It is classic from this mine in Washington state. The crystals form these pretty bright yellow-green "books" or sheaves.