satin spar


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

satin spar:

see calcitecalcite
, very widely distributed mineral, commonly white or colorless, but appearing in a great variety of colors owing to impurities. Chemically it is calcium carbonate, CaCO3, but it frequently contains manganese, iron, or magnesium in place of the calcium.
..... Click the link for more information.
; gypsumgypsum
, mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO4·2H2O. It is the most common sulfate mineral, occurring in many places in a variety of forms. A transparent crystalline variety is selenite.
..... Click the link for more information.
.

satin spar

[′sat·ən ′spär]
(mineralogy)
A white, translucent, fine fibrous variety of gypsum having a silky luster. Also known as satin stone.