Description: 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.

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