Basalt – Official Minecraft Wiki
Basalt is an igneous rock found in the Nether. Polished basalt is the polished version of basalt. Basalt generates naturally as basalt pillars, which are found in the soul sand valley biome. They also generate in the basalt deltas biome as regular terrain and as part of basalt columns. Both basalt and polished basalt can be found naturally as part of bastion remnants. Basalt drops as an item ...