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21w08a is the eleventh snapshot for Java Edition 1.17, released on February 24, 2021,[1] which adds deepslate ores among other changes to cave generation.

Additions

Blocks

Smooth Basalt
Deepslate Ore
  • Added deepslate variants of diamond, iron, gold, lapis lazuli, and redstone ores.
  • Takes twice as long to mine as normal ores.
  • Has the texture of deepslate replacing the normal stone texture.
  • Takes place of ores that generate in deepslate.
    • Normal stone ores may still generate deep underground if they replace a different block, such as tuff.
  • Can be used in blasting and smelting recipes like normal ores.
    • These recipes can be unlocked in the recipe book with deepslate ores as well.
Cobbled Deepslate
  • Drops from deepslate when mined with a pickaxe.
  • Functions identical to cobblestone and blackstone in that it can be used to craft basic tools, furnaces, and brewing stands.
  • Is used to craft all the deepslate variant blocks instead of regular deepslate.
  • Has wall, stair, and slab variants as well.

World generation

Crack carvers
  • Deep, long cracks in the ground that are thinner and straighter than canyons.
  • Can reach over 90 blocks in depth.

General

Tags
  • Added the deepslate_ore_replaceables block tag.
    • Contains deepslate.
  • Added the diamond_ores, iron_ores, lapis_ores, and redstone_ores block and item tags.
    • Contain the normal and deepslate variants of each ore type.
  • Added the stone_ore_replaceables block tag.
    • Contains stone, granite, diorite, andesite, and tuff.

Changes

Blocks

Blackstone
  • Texture has been tweaked slightly.
Grimstone
  • Has been renamed to "Deepslate".
  • Is no longer used to craft or repair any blocks or items.
Coal ore, Copper Ore, Emerald Ore, Gold Ore, Iron Ore, Lapis Lazuli Ore, Redstone Ore
  • Have had their textures tweaked.
  • All apart from Coal, Copper and Emerald now have deepslate variants.
  • Copper ore has oxidized areas.
  • Gold ore is once again unique from nether gold ore.
Spore blossoms
  • Particles now appear in the air around the block.

World generation

21w08a approximate ore distribution

Ore distribution changes.

Mineral distribution
  • Ore distribution has been changed again.
Tuff
Andesite
  • No longer generates below Y = 0.
Lava
  • Once again generates at the bottom of the world starting at Y = -54.

General

Creative inventory
  • Slime blocks and honey blocks have been moved to the Redstone tab.
    • The category for the recipe book advancements for these recipes have moved as well.
Tags
  • Added tuff to the base_stone_overworld block tag.
  • Added deepslate gold ore to the gold_ores block and item tags.

Fixes

3 issues fixed
From the 1.17 development versions
  • MC-213926 – Rooted dirt footstep sounds are considerably quieter than normal dirt footstep sounds.
  • MC-214782 – Geodes can generate floating in caves.
  • MC-214843 – Old style caves don't generate past Y=0.

References

  1. "Minecraft Snapshot 21w08a" – Minecraft.net, February 24, 2021
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