Gem, Rock, and Mineral Postage Stamps Featuring
Gypsum


Mineral Name: Gypsum

Composition: Calcium sulfate hydrate

Nomenclature: Named after the Greek word gypsos which means "plaster" or "chalk" because of its uses.

Industrial Uses: Plaster of Paris, wallboard, agriculture, carvings.

Additional Notes: Several varieties of gypsum exist. Selenite is the name given to clear, colorless crystals of gypsum. Satin spar is the variety name for masses of extremely fine, needle-like, parallel gypsum crystals. Desert rose is the name given to bladed gypsum crystals that are interlocked in a rose shape (desert rose also describes a similar arrangement of barite crystals). Solid masses of gypsum without discernable crystal structure are given the variety name alabaster. Gypsum is extremely soft and can be scratched with a fingernail. This makes the material very easy to carve. Gypsum pellets expand when water is applied. This makes gypsum good as an agricultural product for breaking up soil for planting.



Afars & Issas : Scott C101 : 85 francs : 25 Oct 1974

Gypsum (Petrified Wood)



Algeria : Scott 710 : 70 centimes : 21 Apr 1983

Gypsum (desert rose)



Central Africa : Scott 1263 : 2000 francs : 1998

Gypsum (desert rose); Gold; Realgar



Cyprus : Scott 915 : 25 cents : 9 Mar 1998

Gypsum



Germany, DDR : Scott 1354 : 5 pfennige : 22 Feb 1972

Gypsum (var. selenite)



Kenya : Scott 98 : 10 cents : 13 Dec 1977

Gypsum



Namibia : Scott 674 : 1 cent : 2 Jan 1991

Gypsum (var. selenite rose)



Tunisia : Scott 1145 : 250 millimes : 29 Nov 1997

Gypsum (desert rose)