Calcite and Fluorite. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It has a Mohs Scale hardness of 3. Fluorite (also called fluorspar) is a halide mineral composed of calcium fluoride, CaF2. It has a Mohs Scale hardness of 4. Approximate specimen dimension: 13 x 9 x 6 cm. Denton Mine, Southern Illinois.
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