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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. Also called iridosmine.


(Elements & Compounds) a very hard corrosion-resistant white or grey natural alloy of osmium and iridium in variable proportions, often containing smaller amounts of platinum, ruthenium, and rhodium: used esp in pen nibs. Also: iridosmine
[C19: from osm(ium) + iridium]


(ˌɪr ɪˈdɒz mɪn, -ˈdɒs-)

a native alloy of iridium and osmium, usu. containing some rhodium, ruthenium, platinum, etc., used esp. for the points of gold pens.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.osmiridium - 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.
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
References in periodicals archive ?
There 'he' joins the rough miners seeking the rare metal osmiridium, and meets the handsome Salarno, 'the older man' above.
Bjelke Petersen and Mills talked to the osmiridium miners and noted their slang, as well as the processes of working and refining the metal.
34 (= loparite-(Ce)) (1996), 991 Osmiridium (= iridium) Harris and Cabri: Can.