Formula: MnSO4 . 7H2O
Origin of name: For F. E. Mallard, French crystallographer
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pale rose
Diaphaneity:
Luster: Vitreous
Habit: Fibrous, masses and crusts
Hardness: ~ 2
Specific gravity: 1.846
Cleavage: 1; {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments: Soluble in water; dehydrates rapidly becoming opaque and mealy
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