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Iridium

Year of discovery: 1804 (World), 1936 (Japan)

Locality list: 16 localities of iridium

• Ir
• (Ir,Os,Ru,Pt)
• [Ir]

• Class: Platinum group
• Class: Native elements
• Variety: Osmiridium (+Os)
• Insoluble in: Aqua regia

• Polymorph: Rutheniridosmine (Hexagonal)

• Ir => Os: Osmium
• Ir => Pt: Platinum
• Ir => Pd: Palladium
• Ir => Rh: Rhodium
• Ir => Ru: Ruthenium
• Ir => Fe: Hexaferrum, Iron
• Ir => Ni: Nickel, Taenite

• Color: Silver white
• Streak: Silver white
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Cubic
• Twin: {111}

• Cleavage: Indistinct on {001} (3 plane)
• Hardness: 6-7
• Density: 22.7

• System: Cubic
• Group: m3m, Fm3m
• Lattice: a=3.8

Name: Iris, rainbow in Latin as related minerals are colorful.

Synonym: Native Iridium