[ Top ] [ Japanese ]

Ferro-hornblende

Year of discovery: 1789 (World as Hornblende), 1978 (World as Ferro-hornblende), 1917 (Japan)

Locality list: 32 localities of ferro-hornblende

• Ca₂Fe₄AlAlSi₇O₂₂(OH)₂
• [][Ca²⁺₂][Fe²⁺₄][Al³⁺][(OH)₂|AlSi₇O₂₂]^15-

• Class: Hornblende series < Ca amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Ino-Aluminosilicate (Double chain) - Hydroxide
• Insoluble in: HCl

• Ca => Na₂: Ferro-katophorite

• Fe => Mg: Magnesio-hornblende (Series)

• Al => Fe: Ferro-ferri-hornblende

• Si => Fe: Ferro-ferri-tschermakite

• CaFe => NaAl: Ferro-barroisite

• CaAl => NaSi: Ferro-winchite

• []Al => NaFe: Ferro-edenite

• []Si => NaAl: Ferro-pargasite
• []Si => KAl: Potassic-ferro-pargasite

• Al₂ => FeSi: Ferro-actinolite

• FeSi => Al₂: Ferro-tschermakite

• OH => F: Ferro-fluoro-hornblende

• Color: Black-Dard green
• Streak: Pale greenish gray
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.0

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.0, b=18.2, c=5.3, β=104.9

Synonym: Barkevikite