Java Edition 21w08a

21w08a is the eleventh snapshot for Java Edition 1.17, released on February 24, 2021, which adds deepslate ores among other changes.

Blocks

 * Smooth Basalt
 * Generates in place of the tuff layer on amethyst geodes.
 * Can be obtained by smelting basalt.
 * Deepslate Ore
 * Takes twice as long to mine as normal ores.
 * Has the texture of deepslate replacing the normal stone texture.
 * Takes place of stone ores below Y=0.

Blocks

 * Deepslate
 * Grimstone is now referred to as "deepslate" and has a cobbled variant, which is used to craft other deepslate blocks.
 * Ores
 * The new ore textures have been tweaked again, as well as Emerald and Lapis Lazuli ore being slightly changed.

World generation

 * Mineral distribution
 * Ore distribution has been changed again.
 * Tuff
 * Now generates in mineral veins below y = 0.
 * Andesite
 * No longer generates below y = 0.