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Ferri-winchite

Year of discovery: 1978 (Ilmenogorsky complex, Russia), 1979 (Japan)

Locality list: 3 localities of ferri-winchite

• CaNaMg₄FeSi₈O₂₂(OH)₂
• [][Ca²⁺][Na⁺][Mg²⁺₄][Fe³⁺][(OH)₂|(Si₄O₁₁)₂]^14-

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

• Ca => Mn: Ferri-ghoseite

• Mg => Fe: Ferro-ferri-winchite

• Fe => Al: Winchite

• []Fe => NaMg: Richterite

• NaFe => CaMg: Tremolite

• []Si => NaAl => Ferri-katophorite

• NaSi => CaAl => Magnesio-ferri-hornblende

• MgSi => FeAl: Ferri-barroisite

• Color: Black
• Streak: Greenish gray
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Distinct on {110} (2 planes, 120 degree)
• Hardness: 5.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=18.0, c=5.3, β=104.1