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Fluorite with Pyrite. Complex crystal showing many parallel 2 mm faces in a larger, rounded form. Color zoned from purple interior to blue-gray exterior. Fluoresces orange under UV illumination. From the Thomaston Dam Railroad Cut, Thomaston, Connecticut, USA. Ex. Sahno collection.
Measures: 5.5 x 4 x 2.5 cm
Photo courtesy of John Betts - Fine Minerals