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Aragonite

From Academic Kids

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Aragonite

Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. Its structure differs from calcite and leads to a different crystal shape, an orthorhombic system with acicular crystals. By repeated twinning pseudo-hexagonal forms result. It may be columnar or fibrous, occasionally in branching stalactitic forms called flos-ferri (flowers of iron) from their association with the ores at the Carthinian iron mines. The type location for aragonite is Molina de Aragn (Guadalajara, Spain), 25 km outside Aragon.

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Aragonite crystal from Aragon, Spain.

It exists naturally in the shells of chiton and other mollusks. The fossil shells of some extinct ammonites form a mineral called ammolite, which is primarily aragonite with impurities that make it iridescent and valuable as a gemstone.

See also

External link

bg:Арагонит de:Aragonit es:aragonito eo:Aragonito fr:Aragonite hu:aragonit it:aragonite nl:Aragoniet pl:Aragonit pt:aragonita

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