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Ferro-ferri-holmquistite

Year of discovery: 2022 (Japan as the first occurence in the World)

Locality list:

• Li₂Fe₃Fe₂Si₈O₂₂(OH)₂
• [][Li⁺₂][Fe²⁺₃][Fe³⁺₂][(OH)₂|(Si₄O₁₁)₂]^14-

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

• Polymorph: Clino-ferro-ferri-holmquisite (Monoclinic)

• Li => Na: Riebeckite

• Fe³⁺ => Al: Ferro-holmquistite

• Color: Blue
• Streak: Bluish gray
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {210} (2 planes, 120 degree)
• Hardness: 5.5
• Density: 3.3

• System: Orthorhombic
• Group: mmm, Pmma
• Lattice: a=18.5, b=17.9, c=5.3