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Lepidocrocite

FeO(OH)

Year of discovery: 1813 (Zlaté Hory (Zuckmantel), Czech), 1955 (Japan)

Locality list: 30 localities of lepidocrocite

• γ-[Fe³⁺][OH|O]^3-
• A component of Limonite

• Class: Böhmite (Bohmite) group
• Class: Oxide - Hydroxide

• Polymorph: Goethite (α), Akaganeite (β), Feroxyhyte (δ)

• Fe => Al: Diaspore (α), Böhmite (Bohmite) (γ)
• Fe => Mn: Groutite (α), Feitknechtite (β), Manganite (γ)
• Fe => V: Montroseite
• Fe => Cr: Guyanaite, Bracewellite
• Fe => Ga: Tsumgallite
• Fe => Co: Heterogenite

• Color: Dark brown
• Streak: Orange
• Luster: Sub-Metallic
• Diaphaneity: Transparent

• Habit: Acicular
• Aggregate: Reniform

• Cleavage: Perfect on {010} and {100} (2 planes), Good on {001} (1 plane)
• Hardness: 5
• Density: 4.1

• System: Orthorhombic
• Group: mmm, Amam
• Lattice: a=3.9, b=12.5, c=3.1

Name: Lepidos (Scale) -kroke (fiber) in Greek