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Feroxyhyte

Year of discovery: 1976 (Kolomyia, Ukraine), 1997 (Japan)

Locality list: A locality of feroxyhyte

• FeO(OH)
• δ-[Fe³⁺][OH|O]^3-

• Class: Heterogenite group
• Class: Oxide - Hydroxide
• Magnetism: Paramagnetic
• Phase transition: Transit to Goethite under ambient condition.

• Polymorph: Goethite (α, Orthorhombic), Akaganeite (β, Monoclinic), Lepidocrocite (γ, Orthorhombic)

• 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: Yellow-Brown
• Streak: Yellow
• Luster: Earthy
• Diaphaneity: Opaque

• Density: 4.2

• System: Hexagonal
• Lattice: a=2.9, c=4.6