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Potassic-magnesio-arfvedsonite

Year of discovery: 1985 (Highway 399 roadcut, Canada), 2021 (Japan)

Locality list: A locality of potassic-magnesio-arfvedsonite

• (K,Na)Na₂Mg₄FeSi₈O₂₂(F,OH)₂
• [(K,Na)⁺][Na⁺₂][Mg²⁺₄][Fe³⁺][(F,OH)₂|(Si₄O₁₁)₂]^14-

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

• (K,Na) => Na: Magnesio-arfvedsonite

• Mg => Fe: Potassic-arfvedsonite

• Color: Grayish green
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: Perfect on {110} (2 planes, 120 degree)

• System: Monoclinic
• Group: 2/m, C2/m