Formula: Fe(OH)3 . nH2O
Origin of name: For John Bernal, English crystallographer
Crystal system: Orthorhombic
Crystal class: 2m 2/m 2/m
Twinning: polysynthetic
Unit cell:
Colour: Dark bottle green
Diaphaneity:
Luster: Vitreous to adamantine
Habit: Flattened pyramidal to pseudo-octahedral crystals to 3 mm
Hardness: 4
Specific gravity: 3.32
Cleavage: None
Tenacity:
Streak: Pale green
Synonyms/varieties:
Comments:
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