Calcite on fluorite, from Illinois

Calcite, calcium carbonate, is one of the most ubiquitous minerals on the earth's surface. It is the constituent of seashells and tiny marine organisms. When these animals die their shells fall to the seabed and eventually are compressed and transformed i

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Arem Calcite Calcium Carbonate Cave Crystal Crystals Fluorite Form Illinois Limestone Mineralogy Minerals Ores Shape Specimen Specimens

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