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Pearl

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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.

A dense spherical calcareous concretion, usually white or light-colored, consisting of predominant nacrous layers of aragonite (or rarely calcite) and occasional layers of conchiolin; deposited concentrically about a foreign particle within or beneath the mantle of various marine and freshwater mollusks; occurs either free from or attached to the shell.


Visit gemdat.org for gemological information about Pearl.


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Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for PearlHide

Localities for PearlHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Northern Territory
http://gemexplorer.org/archives/australian-pearls
France
 
  • French Polynesia
    • Tuamotu-Gambier (Tuamotu and Gambier Islands)
http://gemexplorer.org/archives/australian-pearls
Persian Gulf
http://gemexplorer.org/archives/arabian-gulf-natural-pearls
Philippines
 
http://gemexplorer.org/archives/philippines-pearls
Mineral and/or Locality  
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