Formula: CaCO3
Origin of name: for H. Vater, German mineralogist
Crystal system: hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 7.135, c = 16.98
Colour: Colourless
Diaphaneity: Transparent
Luster:
Habit: Platy, fine fibrous
Hardness: About 3
Specific gravity: 2.54
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: trimorphous with aragonite and calcite
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