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Cobaltpentlandite

Year of discovery: 1959 (Varislahti deposit, Finland), 1953 (Japan)

Locality list: 15 localities of cobaltpentlandite

• Co₉S₈
• (Co,Ni,Fe)₉S₈
• [Co²⁺₉][S₈]

• Class: Pentlandite group
• Class: Sulfide

• Co => Fe: Pentlandite (Series), Mackinawite
• Co => Ni: Godlevskite

• Color: Yellow (Brighter than pentlandite
• Streak: Dark brown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Massive. Single crystal over mm is rare

• Cleavage: Good on {100} (3 planes)
• Hardness: 4-4.5
• Density: 5.3

• System: Cubic
• Group: m3m, Fm3m
• Lattice: a=10.0

Etymology: Co-bearing Pentlandite