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Alabaster  (Gypsum)CaSO4 - 2H2O

Class: Sulfate
Hardness: 2
Density: 2.3
Streak: White
Lustre: Vitreous
Habit: Granular / massive form of gypsum
Colours: Colourless or white (typical)

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

Identification in hand sample:
Identified by hardness and good cleavage.

Associations:
Common in marine evaporite deposits.

Industrial / ecomonic uses:
Modern use is in gypsum wallboard used in construction. Used as an ornamental stone and for sculpture due to its softness.

Comments:
Also known as "satin spar".

  

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