A specimen of fluorite

A specimen of fluorite

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Credit: MICHAEL BARNETT/SCIENCE PHOTO LIBRARY

Caption: A specimen of the mineral fluorite (calcium fluoride). Fluorite is found in many geological environments, from formations associated with metallic ores such as lead and silver, to sedimentary deposits associated with gypsum, dolomite and calcite. Fluorite is used in the production of hydrofluoric acid, which is important to the pottery, optical and plastics industries. Very clear crystals are used as apochromatic lenses and spectographic prisms.

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Keywords: earth science, fluorite, geology, mineral

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