MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY
Fluorite (also called fluorspar) is a halide mineral composed of calcium fluoride, CaF2. It has a Mohs Scale hardness of 4. Approximate specimen dimension: 10 x 6 x 6 cm. Minerva Mine #1, Cave-in-Rock District, Southern Illinois, USA.
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