Formula: 2CaSO4 . H2O
Origin of name: For Francesco Bassani, Italian palaeontologist
Crystal system: Orthorhombic
Crystal class: 32
Twinning:
Unit cell: a = 12.03 Ǻ, b = 12.70 Ǻ, c = 6.93 Ǻ
Colour: Colourless, white
Diaphaneity:
Luster:
Habit: Crystals microscopic, acicular
Hardness:
Specific gravity: 2.70
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties: Hemihydrate, miltonite, mirupolskiet, plaster of paris
Comments:
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