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Nickelskutterudite

Year of discovery: 1892 (Schneeberg district, Germany), 1941 (Japan)

Locality list: 3 localities of nickelskutterudite

• (Ni,Co,Fe)As₃
• [Ni⁴⁺Co³⁺Fe²⁺][As₃]^4-

• Class: Skutterudite subgroup < Non-stoichiometric A-site vacant quadruple group ([]₄B₄X₁₂) < Non-stoichiometric perovskites < Perovskite supergroup
• Class: Arsenide
• Soluble in: HNO₃

• Ni => Fe: Ferroskutterudite
• Ni => Co: Skutterudite (Series)

• Color: Light gray
• Tarnish: Iridescent, Gray
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Granular by {001} and {111}
• Twin: Sixlings on {112}

• Cleavage: Distinct on {001} and {111} (5 planes), Poor on {011} (4 planes)
• Hardness: 5.5-6
• Density: 6.5

• System: Cubic
• Group: m(-3), Im(-3)
• Lattice: a=8.3

Etymology: Nickel from chemical composition and Skutterud region in Norway

Synonym: Chloanthite