General Information:
Chemical Formula:(Os,Ir)
Composition:(Molecular Weight = 382.42 gm)Iridium 50.26 %
IrOsmium 49.74 %
Os Empirical Formula: IrOs
Environment:Occures with platinum in alluvial deposits.
IMA Status:Not IMA Approved
Locality:Choco, Colombia, and the district of Ekaterinburg, Ural Mountains.
Name Origin:Named after the elements iridium (Latin, Iris = "rainbow.") and osmium (Greek, osme = "smell.") in the chemical formula.
Physical Properties: Cleavage:[0001] Perfect
Color:white or gray.
Density:19.3 - 21.12, Average = 20.21
Diaphaniety:Opaque
Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Nuggets - Irregular lumps produced by stream transport of malleable metals.,
Hardness:6-7 - Orthoclase-Quartz
Luminescence:Non-fluorescent.
Luster:Metallic
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