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Orientite

Year of discovery: 1921 (Firmeza District, Cuba), 1990 (Japan)

Locality list: A locality of orientite

• Ca₂Mn₃Si₃O₁₀(OH)₄
• [Ca²⁺₂][Mn²⁺][Mn³⁺₂][(OH)₄|Si₃O₁₀]^12-

• Class: Ardennite group
• Class: Sorosilicate - Hydroxide

• Color: Brown, Black
• Streak: Brown
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Cleavage: Indistinct on {001} and {120} (3 planes)
• Hardness: 4-5
• Density: 3.0

• System: Orthorhombic
• Group: mmm, Cmcm
• Lattice: a=6.1, b=9.0, c=19.1