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Argentopentlandite

Year of discovery: 1977 (Oktyabr'skoe deposit, Russia, and Khovu-Aksy deposit, Russia), 1973 (Japan)

Locality list: 5 localities of argentopentlandite

• Ag(Fe,Ni)₈S₈
• [Ag⁺][(Fe²⁺,Ni²⁺)₈][S₈]

• Class: Pentlandite group
• Class: Sulfide

• Ag => Fe²⁺: Pentlandite, Mackinawite
• Ag => Pb: Shadlunite
• Ag => Mn: Manganoshdlunite
• Ag => Cu: Sugakiite

• Color: Brown
• Streak: Reddish brown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Octahedral
• Aggregate: Pyrrhotite (Eutectic)

• Cleavage: Perfect on {111} (3 planes)
• Hardness: 3.5
• Density: 3.7

• System: Cubic
• Group: m3m, Fm3m
• Lattice: a=10.5

Etymology: Pentlandite containing argent (silver in Latin)