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Potassic-ferro-pargasite

Year of discovery: 1989 (Japan as the first occurence in the World)

Locality list: 2 localities of potassic-ferro-pargasite

• KCa₂Fe₄AlAl₂Si₆O₂₂(OH)₂
• [K⁺][Ca²⁺₂][Fe²⁺₄][Al³⁺][(OH)₂|(AlSi₃O₁₁)₂]^16-

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

• K => Na: Ferropargasite

• Fe => Mg: Potassic-pargasite (Series)

• KFe => []Al: Ferro-tschermakite

• KAl => []Si: Ferro-hornblende

• FeSi => Al₂: Potassic-ferro-sadanagaite

• Color: Black
• Luster: Vitreous
• Diaphaneity: Translucent

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

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.1, c=5.3, β=105.3