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Cobaltite (Photo)

Year of discovery: 1832 (World), 1908 (Japan)

Locality list: 59 localities of cobaltite

• CoAsS
• (Co,Fe)AsS
• [Co²⁺][As³⁺][S]

• Class: Cobaltite group
• Class: Sulfide
• Soluble in: HNO₃
• Insoluble in: HCl
• Magnetism: Paramagnetic (After heating)
• Odor: Garlic odor (by heating)

• Co => Fe: Arsenopyrite
• Co => Ni: Gersdorffite (Series)
• Co => Pt: Platarsite
• Co => Ir: Irarsite
• Co => Rh: Hollingworthite
• Co => Os: Osarsite
• Co => Ru: Ruarsite

• Co₄ => Co₃Fe: Alloclasite
• Co₂ => CoFe: Glaucodot

• As => Sb: Costibite, Paracostibite, Willyamite

• Color: Silver white
• Tarnish: Dark gray
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pseudocubic, Pseudooctahedral
• Striation: Same as pyrite
• Twin: {011}{111} lamella

• Cleavage: Perfect on {100}, {010}, {001} (3 planes)
• Hardness: 5.5
• Density: 6.3

• System: Orthorhombic, Pseudocubic
• Group: mm2, Pca2₁
• Lattice: a=5.6, b=5.6, c=5.6

Etymology: Chemical composition