Description: This is a small grain of native ruthenium with composition (Ru0.51,Os0.25,Ir0.24) from PGM concentrates of Neiva river sands. Analysis has been carried out with JEOL FE-SEM. Harris & Cabri (1973) indicated in the diagram attached that this composition must be related to rutheniridosmine, but according to 50% rule accepted by IMA, it is Ruthenium now.