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Gypsum is a sedimentary rock that is formed by the chemical precipitation of calcium, sulfur, and oxygen. Gypsum, one of the most widely used minerals in the world today for such applications as concrete for highways, bridges, buildings, and many other structures. It is also used to make wallboard and plaster of Paris.

Selenite is variety of gypsum occurring in transparent crystals or well-crystallized masses.
CaSO4 2(H2O), Hydrated Calcium Sulfate
Class:
Varieties:
Maria-glass, alabaster, satin spar, selenite
Colorless, white, gray, yellowish
Colorless
Vitreous to Pearly
Transparent to translucent
2.3
1.5 - 2
Perfect
Conchoidal
Typical monoclinic crystals, often twins, fribrous and platy aggregates, granular, massive.
Crystals with inclusions sometimes bluish to yellowish
Frequency:
Common
Origin:
Rare primary hydrothermal, mostly sedimentary and as a weathering product, associated with anhydrite, halite and other minerals.
Occurence:
Tarnobrzeg, Poland; Gorguel, Spain; Friedrichsrode, Germany; Tunisia; Alageria; Sylva river basin, Perm, Russia.
Application:
Plaster, dry-wall, cement, fertilizer and as a mineral specimen

 
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