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Montroseite

Year of discovery: 1950 (Bitter Creek mine, USA), 1990 (Japan)

Locality list: A locality of montroseite

• VO(OH)
• (V³⁺,Fe³⁺,V⁴⁺)O(OH)
• [V³⁺][OH|O]^3-

• Class: Diaspore group
• Class: Oxide - Hydroxide

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

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

• Cleavage: Good on {010} and {110} (5 planes)
• Hardness: 5.5-6.5
• Density: 4.0

• System: Orthorhombic
• Group: mmm, Pbnm
• Lattice: a=4.8, b=9.5, c=2.9