What an honor it would be to be Smithson Tennant who discovered osmium. It's brittle even at high temperatures. It has the highest melting point and the lowest vapor pressure of the platinum group. It's powder can be sintered in a hydrogen atmosphere of 2000 degrees Celcius. It's powder slowly gives off osmium tetroxide.
Osmium tetroxide is a powerful oxidising agent with a strong smell.
The cost of osmium is a hundred dollars per gram. It's used for instrument bearings, fingerprint detection, Catalysts, ball point pen tips, Microscopy, electrical contacts, phongraphic needles, and electric light filaments.