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aragonite

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aragonite

A carbonate mineral, the stable form of calcium carbonate (CaCO3) at high pressures. It is somewhat harder and has a slightly higher specific gravity than calcite. Aragonite is found in recent deposits formed at low temperatures near the surface of the earth, as in caves as stalactites, with ore minerals, in serpentine and other basic (see acid and basic rocks) rocks, and in sediments. Aragonite is the mineral normally found in pearls, and it occurs in some animal shells. It is polymorphous (same chemical formula but different crystal structure) with calcite and vaterite, and, with geologic time, changes to calcite even under normal conditions.

aragonite [ə′räg·ə‚nīt]
(mineralogy)
CaCO3A white, yellowish, or gray orthorhombic mineral species of calcium carbonate but with a crystal structure different from those of vaterite and calcite, the other two polymorphs of the same composition. Also known as Aragon spar.
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The mollusk deposits a mineral, aragonite and sometimes with a mixture of calcite around the foreign body and the entire concretion is held together by a glue-like substance known as conchiolin.
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Bright kalsit and aragonite stones of spectrum colors formed these courses.
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Living on a steady diet of copper and tin, the organisms on the statue had "digested" the metals to produce shells with unusual ratios of magnesium calcite and aragonite, for example, as well as traces of feldspar and quartz.
1st century Greek statue may aid in development of "biofouling" ... by Asian News International
 
 
 
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