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Ferri-tschermakite

• Ca₂Mg₃Fe₂Al₂Si₆O₂₂(OH)₂
• [][Ca²⁺₂][Mg²⁺₃][Fe³⁺₂][(OH)₂|Al₂Si₆O₂₂]^16-

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

• Ca => Na₂: Ferri-taramite

• Fe => Al: Tschermakite

• Mg => Fe: Ferro-ferri-tschermakite

• []Si => NaAl: Ferri-sadanagaite

• CaAl => NaSi: Ferri-barroisite

• Fe₂ => Mg₂Si₂: Tremolite

• Luster: Vitreous

• Habit: Acicular, Prismatic

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

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