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Winchite [abbr. Wnc, Win ]

Year of discovery: 1906 (Kajlidongri mine, India), 1980 (Japan)

Locality list: 37 localities of winchite

• CaNaMg₄AlSi₈O₂₂(OH)₂
• CaNaMg₄(Al,Fe)Si₈O₂₂(OH)₂
• [][Ca²⁺][Na⁺][Mg²⁺₄][Al³⁺][(OH)₂|(Si₄O₁₁)₂]^14-

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

• Mg => Fe: Ferro-winchite (Series)

• Al => Fe: Ferri-winchite

• []Al => NaMg: Richterite

• NaAl => CaMg: Tremolite

• []Si => NaAl => Katophorite

• NaSi => CaAl => Magnesiohornblende

• MgSi => Al₂: Barroisite

• Color: Blue, Purple, Bluish gray, Colorless
• Streak: Pale blue, Gray
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5.5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=18.1, c=5.3, β=104.5