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Selenite  (Gypsum)CaSO4 - 2H2O

Class: Sulfate
Hardness: 2
Density: 2.3
Streak: White
Lustre: Vitreous
Habit: Large crystalline habit
Colours: Colourless, clear

  Crystal System: Monoclinic
Cleavage: Perfect
Fracture: Splintery
Magnetism: None
Reaction with HCl: Weak

Identification in hand sample:
Single large crystals of gypsum, typified by hardness and transparency.

Associations:
Found in marine evaporites.

Industrial / ecomonic uses:
Used in gypsum wallboard.

Comments:
Sometimes called "satin spar".

  

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