Basalt

Basalt is a type of igneous rock found in the Nether.

Polished basalt is the polished version of basalt.

Natural generation
Basalt generates naturally as basalt pillars, which are found in the biome. They also generate in biomes as regular terrain and as part of basalt columns.

Both basalt and polished basalt can be found naturally as part of bastion remnants.

Breaking
Basalt drops as an item if mined by any pickaxe. If mined by any other tool, it drops nothing.

Post-generation
Basalt can also be made by lava flowing into a space that is on top of soul soil and next to blue ice. The lava is replaced with basalt.

Usage
Basalt is currently used only for decoration. Like blocks such as logs and quartz pillars, basalt can face either horizontally or vertically depending on how they are placed; they face in the direction of the surface they are placed on.

Combined with its easy generation, basalt is an excellent material for building bridges and shelters in the nether. It is even possible to automate the building with a flying machine.

Contrary to the documented blast resistance, basalt can be destroyed by ghast fireballs in Bedrock Edition.

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Trivia

 * Interestingly, despite being an igneous extrusive rock, it has a lower mining time than granite and diorite, which are both igneous intrusive.