minecraft-snapshot-21w16a

Minecraft 1.17 – Snapshot 21w16a

The snapshot 21w16a of Minecraft 1.17 is now available in your launcher. It adds a new behavior to speleothems and also adds large ore veins to the prototype data pack for minecraft 1.18.

Additions and changes:

  • If a stalactite is suspended from a speleothem block with a water source above it, it will grow as well as grow a stalagmite below.
    • The rate of growth is random but very slow, a single stage of growth can take several Minecraft days.
    • A stalactite will only cause a stalagmite to be created or grow if the ground or stalagmite below is within 10 blocks.
    • If the tip of the stalactite is waterlogged, it will not grow or create a stalagmite and if the tip of a stalagmite is waterlogged, or any fluid is between the stalactite and the stalagmite, the stalagmite will not grow.
    • A sharp speleothem will never grow through a fluid.
    • A stalactite can be a maximum of 7 blocks in size

More information…

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:

Want to give feedback?