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Mangano-arfvedsonite

Year of discovery: 1969 (Japan)

Locality list: A locality of mangano-arfvedsonite

• Na₃Mn₄FeSi₈O₂₂(OH)₂
• Na₃Mn₄(Fe,Al)Si₈O₂₂(OH)₂
• [Na⁺][Na⁺₂][Mn²⁺₄][Fe³⁺][(OH)₂|(Si₄O₁₁)₂]^14-

• Class: Na amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Inosilicate (Double chain) - Hydroxide

• Mn => Mg: Magnesio-arfvedsonite
• Mn => Fe: Arfvedsonite

• Fe(OH)₂ => MnO₂: Mangano-mangani-ungarettiite

• Color: Brownish black, Black
• Streak: Pale purplish brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5
• Density: 3.3

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.0, b=18.1, c=5.3, β=104.6

Synonym: Kôzulite (Kozulite)