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Ferro-ferri-tschermakite

Year of discovery: 1997 (World), 2004 (Japan)

Locality list: A locality of ferro-ferri-tschermakite

• Ca₂Fe₅Al₂Si₆O₂₂(OH)₂
• [][Ca²⁺₂][Fe²⁺₃][Fe³⁺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-ferri-taramite

• Fe²⁺ => Mg: Ferri-tschermakite

• Fe³⁺ => Al: Ferro-tschermakite

• CaAl => NaSi: Ferro-ferri-barroisite

• []Fe³⁺ => NaFe²⁺: Hastingsite

• []Si => NaAl: Ferro-ferri-sadanagaite

• Fe³⁺Al => Fe²⁺Si: Ferro-ferri-hornblende

• Al₂ => Si₂: Ferro-actinolite

• Color: Greenish black
• Luster: Vitreous

• Cleavage: Distinct on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.5

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