Osmium

Osmium is a dense, bluish-silver metal that is one of the heaviest elements on the periodic table. It is rare and often found in a mixed form with other platinum-group metals. Known for its hardness, osmium is used in specialized applications like fountain pen tips, electrical contacts, and certain types of alloys. Despite its durability, osmium can be toxic in some forms, requiring careful handling. Its unique properties make it valuable in various industrial fields, but its scarcity means it is not widely used compared to other metals like gold or platinum.