Soul Sand

Soul sand is a block found naturally only in the Nether. Soul sand usually slows down the movement of mobs and players standing on it. It is also used for growing nether wart and for constructing a Wither.

Natural generation
Soul sand is found below Y=65 in the nether wastes, generally in four-block-deep layers. It is also found naturally in nether wart rooms of nether fortresses.

Soul sand also generates in bastion remnants.

Soul sand also generates in soul sand valleys as part of the surface terrain.

Soul sand can generate in the Nether in the form of mineral veins. Soul sand attempts to generate 12 times per chunk in veins of size 1-12, from altitudes 0 to 31, in soul sand valleys.

Breaking
Soul sand can be mined with any tool (or none), but shovels are the quickest.

Bartering
Piglins may barter 2–8 soul sand when given a gold ingot‌.

Usage
Soul sand slows the movement of any mob or player and causes them to sink 2 pixels into the block while walking on it.

Most blocks that can be placed on full blocks can be placed on soul sand, with the notable exceptions of both types of fungi, both types of roots, and nether sprouts.

Growing nether wart
Soul sand is used for growing nether wart, a primary base ingredient for many varieties of potions. Nether wart is planted on soul sand (like seeds on farmland), and at full maturity produces multiple nether warts when harvested.

Withers
4 blocks of soul sand (or soul soil) are used in the construction of a wither.

Bubble columns
Placing soul sand under source water blocks creates a lifting bubble column, which causes items, players, and mobs inside the column to rise to the surface. The bubble column extends upward through any number of empty water source blocks (not waterlogged blocks).

Note blocks
Soul sand can be placed under note blocks to produce cowbell sounds.

Fire
Fire lit on soul sand becomes soul fire, which burns infinitely. By the way, your mom is glad that you play Minecraft :)

Sounds




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Trivia

 * Soul sand can generate on the floor of caverns and lava pools below Y=60 only if it generated in that same column at Y=60 or above.
 * Because soul sand is not as high as a full block, standing near lava while on soul sand sets the player on fire. Standing near water while on soul sand extinguishes the player, though direct contact to fire sources still hurts them.
 * If a water current is pushing the player diagonally against a wall and soul sand is the block adjacent to the player's head when the current ends, it causes the player to jump.
 * If snow or carpet is over soul sand, the effects of it being a partial block are avoided because the player walks on the cover block, not the soul sand.
 * Despite soul sand being a type of sand, it does not fall the same way sand and gravel do.
 * Falling gravel turns into an item when it falls on soul sand. This means gravel cannot fill in lava if soul sand is underneath. 1.16 has soul sand valley biomes, with it underneath lava.