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Ferro-holmquistite

Year of discovery: 2004 (Greenbushes mine, Australia)

Locality list:

• Li₂Fe₃Al₂Si₈O₂₂(OH)₂
• [][Li⁺₂][Fe²⁺₃][Al³⁺₂][(OH)₂|(Si₄O₁₁)₂]^14-

• Class: Li amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Inosilicate (Double chain) - Hydroxide

• Li => Na: Ferro-glaucophane

• Fe => Mg: Holmquistite

• Al => Fe: Ferro-ferri-holmquistite

• Color: Black, Dark purple, Blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

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

• System: Orthorhombic
• Group: mmm, Pnma
• Lattice: a=18.3, b=17.7, c=5.3