calcite
n.
mineral that contains calcium carbonate
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 (f)
n.
calcite, mineral that contains calcium carbonate
Calcite
(n.)
Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
Calcite
General Information:
Chemical Formula:
CaCO3
Composition:
(Molecular Weight = 100.09 gm)
Calcium 40.04 %
CaCarbon 12.00 %
C Oxygen 47.96 %
O Empirical Formula:
(CO3)
Environment:
Found in sedimentary, igneous, and metamorphic rocks.
Locality:
Common world wide.
Name Origin:
From the Latin, calx, meaning lime.
Physical Properties:
Cleavage:
[1011] Perfect, [1011] Perfect, [1011] Perfect
Color:
colorless, white, pink, yellow, or brown.
Density:
2.71
Diaphaniety:
Transparent to translucent to opaque
Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite)., Massive - Uniformly indis tinguishable crystals forming large mass
Hardness:
3 - Calcite
Luminescence:
Fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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