Formula: γ-FeO(OH)
Origin of name: From Greek for scale and fibre
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Deep red to reddish brown
Diaphaneity: Transparent
Luster: Submetallic
Habit:
Hardness: 5
Specific gravity: 3.85
Cleavage: 3; {010} perfect, {100} less perfect, {001} good
Tenacity:
Streak: Dull orange
Synonyms/varieties:
Comments: Polymorphous with akaganeite, feroxyhyte, and goethite
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