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Calcite
Wright-McGrady Mine, Karnes Uranium District, Karnes Co., Texas, USA
120 x 150mm.
Chunk of a concretion 120 x 150mm. Scalenohedral calcite fluoresces light pink. Rhombohedral calcite is red, chalcedony is green, and the blue is the micrite matrix, although this is more a reflection than fluorescence. (Author: Paul Bordovsky)
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