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.

Grimstone is now referred to as "deepslate" and has a cobbled variant, which is used to craft other deepslate blocks. The new ore textures have been tweaked again, as well as Emerald and Lapis Lazuli ore being slightly changed. Deepslate ore takes twice as long to mine as normal ores and are found in place of where any other ores would be found below Y=0. The tuff layer of Amethyst Geodes is now replaced with a new block called "smooth basalt," which can be obtained by smelting basalt in a furnace. Ore distribution has been changed again.