Calcite
The
carbonate mineral, calcite, is a chemical or biochemical
calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the
Earth's surface. It is a common constituent of
sedimentary rocks,
limestone in particular. It is also the primary mineral in
metamorphic marble. It also occurs as a
vein mineral in deposits from
hot springs, and also occurs in
caverns as
stalactites and
stalagmites. Calcite is often the primary constituent of the shells of marine organisms, e.g.,
plankton (such as
coccoliths and planktic
foraminifera), the hard parts of red
algae, some
sponges,
brachiopoda,
echinoderms, most
bryozoa, and parts of the shells of some
bivalves, such as
oysters and rudists). Calcite represents the stable form of calcium carbonate;
aragonite will change to calcite at 470°C, and
vaterite, or μ-CaCO3, is less stable still.
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Calcite
Calcit
Kalcyt
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Calcite
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