MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY
Calcite. Image 1 of 2. Cut and polished crystals of the mineral calcite (or calcspar). Calcite is composed of calcium carbonate. It is fluorescent under ultraviolet light. It is the main constit- uent of limestone, chalk and marble. It can also form stalactites or be deposited as large crystals by slowly-cooling lava. Photographed under white light. For the same specimen under ultraviolet light, see E425/693.
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