Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Clarkeite is a uranium oxide mineral of composition (Na,Ca,Pb)2(UO2)2(O,OH)3 or (Na,Ca,Pb)(UO2)O(OH)·0-1H2O. The color of samples varies from dark brown to reddish orange. Clarkeite forms by oxidation and replacement of uraninite late during pegmatite crystallization. Although uraninite-bearing granite pegmatites are common, clarkeite is rare and occurs intimately intergrown with other uranium minerals. It is known from only two localities; the Spruce Pine pegmatite district in western North Carolina, USA, and Rajputana, in the Ajmer district, India.

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