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Ferro-pargasite [abbr. Fprg ]

Year of discovery: 1961 (World), 1963 (Japan)

Locality list: 15 localities of ferro-pargasite

• NaCa₂Fe₄AlAl₂Si₆O₂₂(OH)₂
• [Na⁺][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

• Na => K: Potassic-ferro-pargasite

• Fe => Mg: Pargasite (Series)

• Al => Fe: Hastingsite

• NaFe => []Al: Ferro-tschermakite

• NaAl => []Si: Ferro-hornblende

• CaFe => NaAl: Ferro-taramite

• Al₂ => FeSi: Ferro-edenite

• Fe(OH)₂ => TiO₂: Ferro-kaerusutite

• Color: Greenish brown-Dark green
• Streak: Pale greenish gray, Brownish green
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.0, b=18.1, c=5.4, β=105.1