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Fero-katophorite

Year of discovery: 1894 (Gruesletten, Norway, Lågendalen, Norway, and Kjose-Oklungen railway cut, Norway), 1928 (Japan)

Locality list: 7 localities of ferroindialite

• Na₂CaFe₄Al₂Si₇O₂₂(OH)₂
• [Na⁺][Ca²⁺][Na⁺][Fe²⁺₄][Al³⁺][(OH)₂|AlSi₇O₂₂]^15-

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

• Na₂ => Ca: Ferro-hornblende

• Fe => Mg: Katophorite (Series)

• Al => Fe: Ferro-ferri-katophorite (Series)

• NaAl => []Si: Ferro-winchite

• Al₂ => FeSi: Ferro-richterite

• FeSi => Al₂: Ferro-taramite

• Color: Black, Dark green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree), Parting on {010} (1 plane)
• Hardness: 5
• Density: 3.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.0, b=18.0, c=5.3, β=105.0