Basalt pillars are tall features made up of basalt blocks.
Generation
Basalt pillars as they generate in a soul sand valley
Basalt pillars are vertical basalt formations that generate in the soul sand valley biome. They are registered as a placed feature with a spawn rate of 10 per chunk, ensuring they appear frequently. Their height and distribution are randomized based on placement rules, contributing to the biome's rugged aesthetic.
Construction
Basalt pillars have their starting points in the ceiling of an area, then have a pillar of between one and three blocks wide in both the X and Z axis going all the way down to the ground, where a flat clump of basalt can be found around a 3×3 area from the center of the pillar, as if a vertical lava flow, like those commonly found in the Nether, had solidified.
[Short][NBT Compound / JSON Object] direction Vertical direction of the pillar, being up or down.
[Float][NBT Compound / JSON Object] chance_to_continue Optional probability between 0 and 1 (inclusive) that the pillar continues another block, assuming the block matches can_replace.
[String] cap_feature Optional placed feature at the end of the pillar.