Fluorite, Marcasite, Calcite
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Transparent yellow fluorite crystals with epitaxial marcasite inclusions and calcite crystals, 15 cm, from the Minerva #1 mine, Cave-in-Rock, Hardin County, Illinois. Jeff Scovil photo.
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Mineral guide
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calcium fluoride with a dazzling color range, cubic and octahedral crystals, and UV fluorescence; prized by collectors for Blue John banding.Regional guide
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