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Ferro-tschermakite [abbr. Fts ]

Year of discovery: 1978 (World), 1965 (Japan)

Locality list: 0 localities of ferro-tschermakite

• Ca₂Fe₃Al₄Si₆O₂₂(OH)₂
• [][Ca²⁺₂][Fe²⁺₃][Al³⁺₂][(OH)₂|(AlSi₃O₁₁)₂]^16-

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

• Ca => Na₂: Ferro-taramite

• Fe => Mg: Tschermakite (Series)

• Al => Fe³⁺: Ferro-ferri-tschermakite

• []Al => NaFe: Ferro-pargasite
• []Al => KFe: Potassic-ferro-pargasite

• CaAl => NaSi: Ferro-barroisite

• []Si => NaAl:Ferro-sadanagaite

• Al₂ => FeSi: Ferro-hornblende

• Al₄ => Fe₂Si₂: Ferro-actinolite

• Color: Green-Dark green
• Streak: Pale grayish green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.1, c=5.3, β=105.0