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Mangani-eckermannite

Year of discovery: 2023 (Japan as the first occurence in the world)

Locality list: A locality of mangani-eckermannite

• Na₃Mg₄MnSi₈O₂₂(OH)₂
• Na₃(Mg,Fe)₄MnSi₈O₂₂(OH)₂
• [Na⁺][Na⁺₂][Mg²⁺₄][Mn³⁺][(OH)₂|(Si₄O₁₁)₂]^14-

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

• Mn => Fe: Magnesio-arfvedsonite
• Mn => Al: Eckermannite

• Color: Red, Dark red
• Streak: Pale pink
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 6
• Density: 3.2

• System: Monoclinic
• Group: 2/m, B2/m
• Lattice: a=10.0, b=18.1, c=5.3, β=103.9