1323 Iridium (Var: Osmiridium), Osmium (Var: Iridosmine), Rutheniridosmine, Adamsfield January 19, 2020 James Melville Australasia Australia Tasmania Two (3-4mm) nuggets of “Osmiridium”, from alluvial workings at Adamsfield, Tasmania, Australia. They contain mostly osmium, with lesser iridium and rutheniridosmine, plus minor ruthenium. Collected in the 1920’s. click to view full size image …