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Clarkeite is a uranium oxide mineral of variable composition and uncertain structure. 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. Clarkeite is the only known naturally occurring high-temperature uranate. The general formula for ideal clarkeite is Na[(UO2)O(OH)](H2O)0-1.


Clarkeite: New chemical and structural data

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Clarkeite". A list of authors is available in Wikipedia.
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