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Manganilvaite

Year of discovery: 2002 (Septemvri mine, Bulgaria), 2017 (Japan)

Locality list: A locality of manganilvaite

• CaFe₂MnSi₂O₈(OH)
• [Ca²⁺][Fe²⁺Mn²⁺][Fe³⁺][OH|O|Si₂O₇]^9-

• Class: Lawsonite group
• Class: Sorosilicate - Oxide - Hydroxide

• Mn => Fe: Ilvaite

• Color: Black
• Streak: Dark brown
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: Distinct on {100} (1 plane)
• Hardness: 5.5-6
• Density: 3.9

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=13.0, b=8.9, c=5.8, β=90.2