Formula: CoSO4 . 7H2O
Origin of name: After locality; Bieber, Hessen, Germany
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Rose-red, yellowish-red, pinkish red
Diaphanetiy: Translucent
Luster: Vitreous
Habit: As crusts; stalactitic
Hardness: ~ 2
Specific gravity: 1.948
Cleavage: 2; {001} perfect, {110} fair
Tenacity:
Streak:
Synonyms/varieties:
Comments: Soluble in water; dehydrates in air becoming opaque and mealy
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