osmiridium

noun

A mineral that is a natural alloy of osmium and iridium with small inclusions of platinum, rhodium, and other metals, used in needles and wearing points.

noun

Same as iridosmium.

noun

A hard, corrosion-resistant alloy or osmium and iridium used in pen nibs

noun

a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc.