Java Edition 21w08a

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 "title": "Minecraft 21w08a",
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741840<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000010",
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w07a|◄  21w07a]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w08a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w08b| 21w08b ►]]\n</td>\n</tr>\n</table>"
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21w08a is the eleventh snapshot for Java Edition 1.17, released on February 24, 2021,^[1] which renames grimstone to deepslate, adds deepslate ores, and makes changes to cave generation.

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Cobbled deepslate

• Drops from deepslate when mined with a pickaxe without Silk Touch.
• Functions identically 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.
• Renamed regular deepslate stairs, slabs and walls to cobbled variants.

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Deepslate ores

• Added deepslate variants of diamond, iron, gold, lapis lazuli, and redstone ores.
• Take twice as long to mine as normal ores.
• Have the texture of deepslate replacing the normal stone texture.
• Take 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.

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Smooth basalt

• Generates in place of the tuff layer on amethyst geodes.
• Can be obtained by smelting basalt.

Crack carvers

• Deep, long cracks in the ground that are thinner and straighter than canyons.^[2]
• Can reach over 90 blocks in depth.
• They are very similar to canyons in Bedrock Edition.

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.

Blackstone, deepslate, polished deepslate, chiseled deepslate, deepslate bricks, deepslate tiles and stair, slab and wall variants

• Textures have been tweaked slightly.

Gold ore

• Tweaked texture.
• Is now once again unique from nether gold ore.

Coal ore, copper ore, emerald ore, iron ore, lapis lazuli ore, redstone ore

• Tweaked texture.

Deepslate

• Renamed from "Grimstone".
• Is no longer used to craft or repair any blocks or items.
• Has new unique breaking, placing, and footstep sounds.
• Can only be mined with a Silk Touch pickaxe.

Lava

• Now replaces air below Y=-55.

Spore blossoms

• Particles now appear in the air around the block.

Amethyst geodes

• Can no longer generate fully in midair.
• The tuff layer has been replaced with smooth basalt.

Andesite

• No longer generates below Y=0.

Caves

• Tweaked cave sizes.^[3]
• Ravines and regular cave carvers now generate below Y=0.
• Added more variation to carvers.^[4]
• Caves are now more filled with water.

Glow lichen

• Generates almost twice as often.^[5]

Lava

• Once again generates at the bottom of the world starting at Y=-54.
• Lava springs can now generate below Y=0.

Water

• Water springs can now generate below Y=0.

Mineral distribution

• Ore distribution has been changed again.
  • Iron now generates below Y=0, but in smaller blobs and not as frequently.
    • This was determined to be a bug, which was fixed in snapshot 21w08b.
  • Gold is a little more common, but with 50% of blocks exposed to air skipped.
  • Diamond is the same, but with 50% blocks exposed to air skipped as well.
  • Increased frequency of buried lapis.
  • Copper is now less common.

Mineshafts

• Now generate again in the open air in caves.
• No longer appear floating.

Tuff

• Now generates in ore blobs below Y=0.

Creative inventory

• Slime blocks and honey blocks have been moved to the "Redstone" tab.
  • The categories of the recipes for these blocks in the recipe book have moved as well.
• Lectern position within the "Redstone" tab has been moved out of the "essential" group.

Tags

• Added tuff to the base_stone_overworld block tag.
• Added deepslate gold ore to the gold_ores block and item tags.

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 do not generate past Y=0.