Formula: MnSO3 . 3H2O
Origin of name: From locality; Val Graveglia, Italy
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Euhedral elongate crystals to 0.5 mm with dipyramidal termination, sheaf-like or radial aggregates to 0.2 mm
Hardness:
Specific gravity: 1; Parallel to {010}
Cleavage:
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Soluble in strong acids
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