ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Calcite crystals. Calcite (calcium carbonate) is a typical sedimentary mineral which usually occurs in large masses. Limestones, marbles, alabasters and stalactites & stalagmites are composed of calcite. Calcite crystals are colourless or white. Large, clear crystals were formerly used to make polarizing prisms (Nichol prisms) for microscopes. This specimen measures 11 x 7 cm and was found in Serrana's Mine, Jacupiranga, Brazil.
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