Tuff

Tuff is a porous volcanic rock, found as part of amethyst geodes.

Breaking
Tuff drops as an item if mined by any pickaxe. If mined without a pickaxe, it drops nothing.

Natural generation
Tuff generates naturally as part of the outer layer of amethyst geodes.

Usage
Tuff is currently used only for decoration.

Issues
Tuff Tufo 凝灰岩