Osmium blocks are decorative mineral blocks made from Osmium Ingots which do not appear in normally generated maps anywhere. Osmium blocks have the same texture on all six sides.
Osmium blocks can be made by placing 9 Osmium Ingot in a 3x3 square on a Crafting Table. The 9 ingots can be recovered by placing the block in a crafting grid. This makes iron blocks more functional as storage units than as building units.
Osmium blocks can be mined with a stone, iron, or diamond Pickaxe, taking about 2 seconds to destroy. If an osmium block is mined without the use of a pickaxe, it drops nothing, wasting all 9 ingots.