[ Top ] [ Japanese ]

Manganite (Photo)

Year of discovery: 1827 (Ilfeld, Germany), 1897 (Japan)

Locality list: 101 localities of manganite

• MnO(OH)
• γ-[Mn³⁺][OH|O]^3-

• Class: Oxide - Hydroxide
• Soluble in: HCl (with Cl₂ bubbles)
• Substitutition pseudomorph: Replace Calcite or Rhodochrosite.
• Substitutition pseudomorph: Replaced by Pyrolusite. (Polianite)

• Polymorph: Groutite (α, Orthorhombic), Feitknechtite (β, Trigonal)

• 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: Dark gray, Black
• Streak: Reddish brown, Black
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Habit: Prismatic
• Aggregate: Columnar

• Cleavage: Perfect on {010} (1 plane), Good on {110} and {001} (3 planes)
• Hardness: 4
• Density: 4.3

• System: Monoclinic
• Group: 2/m, B21/d
• Lattice: a=8.9, b=5.3, c=5.7, β=90.0