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Skutterudite

Year of discovery: 1845 (Skuterud mines, Norway), 1934 (Japan)

Locality list: 4 localities of skutterudite

• CoAs_2-3
• (Co,Fe,Ni)As_2-3
• [Co²⁺][As_2-3]

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

• Co => Ni: Nickelskutterudite (Series)
• Co => Fe: Ferronickelskutterudite

• As => Sb: Kieftite

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

• Habit: Cubic, Octahedral, Dodecahedral, Prismatic
• Twin: {112} sixlings, {011}

• Cleavage: Distinct on {001} and {111} (7 planes), Poor on {011} (3 planes)
• Hardness: 5.5-6
• Density: 6.5

• System: Cubic
• Group: m(-3), Im(-3)
• Lattice: a=8.2

Etymology: Skutterud area in Norway