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Ferro-barroisite [abbr. Fbrs ]

Year of discovery: 1922 (World), 2010 (Japan)

Locality list: A locality of ferro-barroisite

• []NaCaFe₃Al₃Si₇O₂₂(OH)₂
• []NaCa(Fe²⁺,Mg)₃(Al, Fe³⁺)₂AlSi₇O₂₂(OH)₂
• [][Na⁺Ca²⁺][Fe²⁺₃Al³⁺₂][(OH)₂|AlSi₇O₂₂]^15-

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

• Fe²⁺ => Mg: Barroisite (Series)

• Al => Fe³⁺: Ferro-ferri-barroisite

• NaAl => CaFe: Ferro-hornblende

• NaSi => CaAl: Ferro-tschermakite

• Al₂ => FeSi: Ferro-winchite

• []Si => NaAl: Ferro-taramite

• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Prismatic

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

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