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Feitknechtite

Year of discovery: 1965 (Franklin mine, USA), 1968 (Japan)

Locality list: 12 localities of feitknechtite

• MnO(OH)
• β-[Mn³⁺][OH|O]^3-

• Class: Heterogenite group
• Class: Oxide - Hydroxide
• Formed by oxidation of Pyrochroite immediately under ambient condition.

• Polymorph: Groutite (α), Manganite (γ)

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

• Color: Brownish black
• Streak: Brown
• Luster: Earthy
• Diaphaneity: Translucent

• Density: 3.8

• System: Trigonal
• Group: (-3)m, P(-3)m1
• Lattice: a=3.3, c=4.7