Minecraft 1.17 Caves & Cliffs – Snapshot 21w07a New Grimstone

17th February 2021
Minecraft News
105 9


A Minecraft Java Snapshot

Another passes by, another snapshot enters the launcher. We hope that you’ve been enjoying exploring the new caves since last week. This week, we’re adding Grimstone along with doing some changes and tweaks. 

Happy mining!


  • Added Grimstone!


Grimstone can be found in the deepest parts of the underground and is slightly tougher to mine than normal Stone.

  • Like Blackstone, Grimstone can be used to craft basic tools, furnaces and brewing stands.
  • You can craft the following blocks with this new stone type:
    • Grimstone Slab
    • Grimstone Stairs
    • Grimstone Wall
    • Polished Grimstone
    • Polished Grimstone Slab
    • Polished Grimstone Stairs
    • Polished Grimstone Wall
    • Grimstone Bricks
    • Grimstone Brick Slab
    • Grimstone Brick Stairs
    • Grimstone Brick Wall
    • Grimstone Tiles
    • Grimstone Tile Slab
    • Grimstone Tile Stairs
    • Grimstone Tile Wall
    • Chiselled Grimstone


  • Tweaks and updates to world generation and ores
  • Changes to the visuals of some ores and stone types
  • Reordered Redstone Tab in Creative Inventory


  • Tweaked huge caves to be more rare and decreased the chance that caves are filled with water
  • Changed ore generation to match the new world height and to add more strategy to mining
  • Tweaked size and positioning of diorite, andesite & granite generation
  • Exception: Diorite and Granite and Dirt no longer generate below y = 0
  • Strongholds are now mostly encased in stone
  • Mineshaft corridors are now supported by log pillars below or chains above when needed
An image comparing ore distribution in the overworld between 1.16 and 1.17.

Comparison between the old or distribution and the new ore distribution. Click here for a link to a full-resolution image.


  • Ores without unique shapes have been given new textures for accessibility reasons, so that each ore is distinguishable by shape alone
  • Being the most iconic ore, Diamond Ore texture is staying the same to keep that classic feel maintained
  • Blackstone, Polished Blackstone Bricks, and Cracked Polished Blackstone Bricks have had some minor touch ups
A comparison between the old textures and the new ones.

Old ore textures on the left and new or textures on the right.


  • The Redstone Tab has been reordered to prioritize highly-used blocks
  • Redstone items/blocks have been grouped and ordered in the following way:
    • Essentials
    • Unique activators
    • Miscellaneous
    • Common activators
    • Openables


  • MC-147589 – Vines no longer randomly generate in jungles
  • MC-208613 – Amount of players who need to sleep to skip the night is calculated incorrectly
  • MC-208618 – Clicking on a bed immediately skips the night if gamerule playersSleepingPercentage is set to 0
  • MC-211224 – Seagrass can occasionally replace parts of a swamp hut
  • MC-214082 – Crash after placing soul sand or magma under 2032 tall water
  • MC-214814 – Strongholds generate floating and without walls, floors, or ceilings when inside caves
  • MC-214844 – Bedrock can be exposed to the air at the very bottom of the new caves
  • MC-214885 – Beacon beam only render 256 blocks from source
  • MC-214973 – Powder snow bucket in a dispenser at y = 319 facing upwards or at y = -64 facing downwards is replaced with empty bucket, despite no powder snow being placed
  • MC-214986 – Large dripstones only generate as stalagmites below Y=0


Snapshots are available for Minecraft: Java Edition. To install the snapshot, open up the Minecraft Launcher and enable snapshots in the “Installations” tab.

Snapshots can corrupt your world, so please backup and/or run them in a different folder from your main worlds.

Cross-platform server jar:

Report bugs here:

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