Java Edition 21w10a

21w10a is the thirteenth snapshot for Java Edition 1.17, released on March 10, 2021, which adds lush caves and new deepslate variants.

Biomes

 * Lush caves
 * Added the Lush Caves biome.
 * Currently the biome is only accessible in single-biome worlds.

Blocks

 * Cracked Deepslate Bricks
 * Added a cracked variation of Deepslate bricks.


 * Cracked Deepslate Tiles
 * Added a cracked variation of Deepslate tiles.


 * Infested Block
 * Added an infested variant of Deepslate.


 * Deepslate Ore
 * Added the deepslate ore for copper, emerald and coal ore, but they will not generate in the world by default, they only have been added for use by creators of maps and data packs.

Structures

 * Azlalea Tree

Blocks

 * Deepslate
 * The texture has been changed.


 * Cobbled Deepslate
 * Can now be smelted back into Deepslate.


 * Ores
 * The textures of some ores have been updated.


 * Lightning Rod
 * Can now be waterlogged.

Items

 * Spyglass
 * The item model has been changed back to a dedicated texture.

Structures

 * Fossils
 * The fossils in the deepest part of the underground generate with Deepslate Diamond Ore instead of Coal Ore.

World generation

 * Ore distribuition
 * Now generates more emeralds in mountains.
 * Now generates more lapis-lazuli.
 * Now generates less copper, gold, and Redstone.
 * Now generates smaller diamond blobs, but slightly more frequent. Less diamond ore overall though.
 * Now generates less iron, and it generates lower down.
 * Reduced air exposure for coal.