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Heterogenite

Year of discovery: 1872 (Wolfgang Maaßen mine field, Germany), 1950 (Japan)

Locality list: 2 localities of heterogenite

• CoOOH
• [Co³⁺][OH|O]^3-

• Class: Heterogenite group
• Class: Oxide - Hydroxide
• Formed by alteration of Spherocobaltite.

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

• Color: Black, Dark brown
• Streak: Dark brown
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Good on {0001} (1 plane)
• Hardness: 3-5
• Density: 4.3

• System: Hexagonal (2H), Trigonal (3R) (Layer-stacking polytype)
• Group (2H): 6/mmm, P6₃/mmc
• Group (3R): (-3)m, R(-3)m
• Lattice (2H): a=2.9, c=8.8
• Lattice (3R): a=2.8, c=13.1