Ancient Debris

Ancient debris is a rare ore found in the Nether, and is the only source of Netherite Scrap. 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 (similarly to lapis lazuli ore) between levels 8–22, and an additional vein of 1–2 ancient debris generates randomly between levels 8–119. There is up to 5 ancient debris blocks per a chunk.

Trivia

 * Ancient debris and blocks of netherite are the only blast resistance blocks that are also moveable by pistons.