Osmium is a hard, blue-gray, transition metal found in trace amounts in platinum ores. With a density of 22.61 g/cm3, osmium is the densest natural element and nearly twice as dense as lead. With a melting point of 3,030°C (5,486°F), osmium is one of the six elemental solid metals at room temperature along with iridium, platinum, rhodium, ruthenium, and gold. https://www.zupyak.com/p/4530245/t/osmium-a-rare-and-dense-transition-metal