Composition: Calcium carbonate
Nomenclature: .
Industrial Uses: Gemstones and jewelry.
Additional Notes: Technically not a mineral due to its organic origin within an oyster, but commonly regarded as a gemstone.
Australia : Scott 1554 : 45 cents : 1996
Pearl
Burma/Myanmar : Scott 196 : 15 pyas : 4 Mar 1968
Pearl
French Polynesia : Scott 360 : 10 francs : 22 Apr 1982
Pearl
French Polynesia : Scott 663 : 66 francs : 14 Jun 1995
Pearl
French Polynesia : Scott 664 : 84 francs : 14 Jun 1995
Pearl
Tanzania : Scott 310 : 1.50 shilling : 22 May 1986
Pearl