Iridosmine
Pronunciation : Ir`i*dos"mine, Ir`i*dos"mi*um
Part of Speech : n.
Etymology : [Iridium + osmium.] (Min.)
Definition : Defn: The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens.
Source : Webster's Unabridged Dictionary, 1913