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Ferro-ferri-hornblende (Photo)

Year of discovery: 2016 (Traversella mine, Italy), 2010 (Japan)

Locality list: 2 localities of ferro-ferri-hornblende

• Ca₂Fe₅AlSi₇O₂₂(OH)₂
• [][Ca²⁺₂][Fe²⁺₄][Fe³⁺][(OH)₂|AlSi₇O₂₂]^15-

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

• Fe => Mg: Magnesio-ferri-hornblende

• Fe => Al: Ferro-hornblende

• OH => F: Ferro-ferri-fluoro-hornblende

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.2, c=5.3, β=104.9