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Ferro-taramite

Year of discovery: 1923 (Liset, Norway), 1929 (Japan)

Locality list: 10 localities of ferro-taramite

• Na₂CaFe²⁺₃Al₄Si₆O₂₂(OH)₂
• [Na⁺][Ca²⁺Na⁺][Fe²⁺₃][Al³⁺₂][(OH)₂|(AlSi₃O₁₁)₂]^16-

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

• Na₂ => Ca: Ferro-tschermakite

• Fe => Mg: Taramite (Series)

• Al => Fe³⁺: Ferro-ferri-taramite

• NaAl => CaFe²⁺: Ferro-pargasite

• NaAl => []Si: Ferro-barroisite

• NaSi => CaAl: Ferro-sadanagaite

• Al₂ => FeSi: Ferro-katophorite

• Al₄ => Fe₂Si₂: Ferro-richterite

• Color: Dark green, Bluish green
• Streak: Greenish gray
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Density: 3.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.1, c=5.4, β=105.8