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A pearl is an organic mineral mixture formed with the soft living tissue of a shelled mollusk. Chemically pearls are made of calcium carbonate, either the mineral aragonite or a mixture of aragonite and calcite, sometimes also with minor vaterite.
Pearls are used as gemstones, but are not regarded as true minerals due to their organic origin.
Visit gemdat.org for gemological information about Pearl. Currently in public beta-test.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: A 6 road cut, Elvas, Portalegre District, PortugalFrom Rui Nunes, 11th Dec 2013 21:48:46