[ Top ] [ Japanese ]

Ferro-winchite [abbr. Fwn ]

Year of discovery: 1992 (Japan)

Locality list: 6 localities of ferro-winchite

• CaNaFe₄AlSi₈O₂₂(OH)₂
• CaNaFe₄(Al,Fe)Si₈O₂₂(OH)₂
• [][Ca²⁺][Na⁺][Fe²⁺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

• Fe => Mg: Winchite (Series)

• Al => Fe: Ferro-ferri-winchite

• []Al => NaFe: Ferro-richterite

• NaAl => CaFe: Ferro-actinolite

• []Si => NaAl => Ferro-katophorite

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

• FeSi => Al₂: Ferro-barroisite

• Cleavage: Perfect (2 planes, 120 degree)

• Color: Blue-Dark blue
• Streak: Pale bluish gray
• Luster: Vitreous

• Cleavage: Good
• Hardness: 5.5

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