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Irarsite

Year of discovery: 1966 (Onverwacht mine, South Africa), 1976 (Japan)

Locality list: 4 localities of irarsite

• IrAsS
• (Ir,Ru,Rh,Pt)AsS
• [Ir⁴⁺][As³⁺][S]

• Class: Cobaltite group
• Class: Sulfide

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

• As => Sb: Tolovkite

• Color: Iron black
• Luster: Metallic
• Diaphaneity: Opaque

• Hardness: 6.5
• Density: 11.9

• System: Cubic
• Group: 2(-3), Pa3
• Lattice: a=5.8

Etymology: Chemical composition