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Akaganeite

Year of discovery: 1959 (Japan as the first occurence in the World)

Locality list: 3 localities of akaganeite

• FeO(OH)
• (Fe,Ni)O(OH,Cl)
• β-[Fe³⁺][OH|O]^3-

• Class: Oxide - Hydroxide

• Polymorph: Goethite (α, Orthorhombic), Lepidocrocite (γ, Orthorhombic), Feroxyhyte (δ, Hexagonal)

• 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: Brown-Dark brown
• Streak: Brown
• Luster: Earthy
• Diaphaneity: Transparent

• Habit: Earthy, Prismatic

• Density: 3.5

• System: Monoclinic
• Group: 2/m, I2/m
• Lattice: a=10.6, b=3.0, c=10.5, β=90.0

Etymology: Akagane mine in Iwate prefecture, Japan

Synonym: Akaganéite