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Aragonite - Wikipedia, the free encyclopedia
Aragonite is a carbonate mineral, one of the two common, naturally occurring polymorphs of calcium carbonate, Ca C O 3. The other polymorph is the mineral calcite.
Aragonite Mineral Data
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The mineral aragonite
Information on the mineral aragonite ... Chemical Formula: CaCO 3: Composition: Calcium carbonate, sometimes with some strontium, lead, and zinc.

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Aragonite

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Aragonite, calcium carbonate mineral, CaCO₃, in its orthorhombic form (see Crystal). Aragonite is harder and less common or stable than calcite, into which it may change over geologic time. It occurs with iron ore and other deposits, around hot springs, and in stalactites and is also secreted by invertebrates as mother-of-pearl and pearl. Its crystals are long, brittle, usually whitish, and transparent to translucent. It has a hardness of 3.5-4 and a sp.gr of 2.9-3.