Ancient Debris

Ancient debris is an extremely rare block found in the Nether, and is the main source of netherite scraps. Its high blast resistance makes it immune to normal explosions. In item form, it floats on lava and cannot be burned by any form of fire.

Generation
Ancient debris generates in the Nether in the form of mineral veins. Up to two veins may generate per chunk: one vein of 1–3 ancient debris attempts to generate with a periodic (similarly to lapis lazuli ore) from levels 8 to 22, and an additional vein of 1–2 ancient debris attempts to generate randomly from levels 8 to 119. There is an average of 1.7 ancient debris blocks per chunk, with a normal maximum of 5. However, it is technically possible for up to 11 ancient debris to be found in a single chunk; adjacent chunks can generate veins on the border with up to 2 blocks spawning in an adjacent chunk. Ancient debris never generates naturally exposed to air and can replace only netherrack, basalt, and blackstone. On average, y-level 11-15 has the most ancient debris.

Breaking
Ancient debris drops as an item if mined by a diamond or netherite pickaxe. If mined by any other tool, it doesn't drop anything.

Smelting ingredient
Ancient Debris can be smelted using a furnace or blast furnace. If a player takes out the netherite scrap, they are rewarded with 2 experience orbs.

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Trivia

 * Despite ancient debris' rarity, emerald ore is actually rarer due to its vein size, specific biomes, and chance per chunk.
 * The texture of the ancient debris is supposed to look like pressed metal plates.
 * Ancient debris yields the most experience of any item when smelted.
 * Ancient debris is actually what remains of the mining activity of the piglins, who extracted all the original netherite ore.
 * Ancient debris does not generate exposed to air, but can sometimes be seen on the surface when it generates adjacent to a fungus.
 * Ancient debris is the only ore that does not use the same texture on all six sides.
 * It is possible to have a vein of 20 ancient debris as 5 ancient debris can generate in a chunk and 4 chunks can meet at a corner meaning if all the veins merged, it would be a vein of 20.