Iridiosmium

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Iridiosmium, also called osmium iridian or iridosmium, is a native compound, with formula (Os, Ir), of the metallic elements iridium and osmium. It occurs naturally as small, extremely hard, flat metallic grains with hexagonal crystal structure, and sometimes contains traces of platinum, palladium, rhodium, and ruthenium. Iridiosmium is used as tips for fountain pen nibs.

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