Ancient Debris

Ancient debris is an ore found in the Nether that is the only source of Netherite. It floats on lava and it can't be burned.

Obtaining
Ancient debris drops as an item if mined by a diamond pickaxe or better. If mined by any other tool, it drops nothing.

Mineral veins
Ancient debris can generate in the Nether in the form of mineral veins. Two veins generate per chunk: one vein of 1–3 ancient debris generates with a periodic Gaussian distribution between levels 8–22, and an additional vein of 1–2 ancient debris generates randomly between levels 7–119. There is up to 4 ancient debris blocks per a chunk.

Usage
They are one of the only piston movable blast resistant blocks besides the block of Netherite.