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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 ?
* the Witwatersrand Basin yields some 93% of South Africa's gold output and contains considerable uranium, silver, pyrite and osmiridium resources
There 'he' joins the rough miners seeking the rare metal osmiridium, and meets the handsome Salarno, 'the older man' above.
The area has also been extensively prospected up to recent times for platinum-group elements (mostly osmium-iridium-ruthenium alloys, usually referred to as "osmiridium"), of which the Bald Hill mining field 5 km to the north-northwest was an important source (mostly in alluvials: Reid, 1921; Ford, 1981; Peck 1990; Peck and Keays, 1990).