Metallic silvery nugget of the very rare Ir-Os-Ru mineral rutheniridosmine in a completely analyzed specimen by SEM/EDS. From Zlatoust District, Chelyabinsk Oblast, Russian Federation. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Rutheniridosmine
A natural ruthenium-iridium-osmium alloy — hard, silver-white metallic grains in platinum placers.
Intro adapted from Wikipedia (CC BY-SA).
Rutheniridosmine is an IMA-recognized mineral species in the native element class, with the chemical formula (Ir,Os,Ru).
Key properties: Metallic luster.
IMA symbol Rir, IMA status: approved, named in 1973.
Found in placer sands, generally derived from ultramafic rocks.
It is found associated with Other Os–Ir–Ru alloys, sperrylite, hollingworthite, iridarsenite, ruthenarsenite, michenerite, laurite, geversite, moncheite, chromite. ??.
The name refers to RUTHENium, IRIDium, and OSMium in the composition; the name applied to hexagonal alloys with Ir dominant.