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Beautiful gemmy transparent yellow cube of fluorite measuring 7.5 cm along one edge with lesser yellow fluorites. A minor scattering of white calcites are upon the fluorite cube. There is a thin zone of pale blue lining the outside of the crystal; there are also many small crystals of chalcopyrite floating within the fluorite. From the Minerva #1 Mine, Cave-in-Rock District, Hardin County, Illinois, USA.
Measures: 9 x 8 x 7.5 cm