Tuff

Tuff is volcanic ash turned into rock, occurring in mineral veins below Y=0.

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

Natural generation
Tuff generates naturally in mineral veins below Y=0.

Usage
Tuff is currently used only for decoration.

Issues
Toba Tuffstein Tuf Tufo Tuff Tuf Tufo Туф 凝灰岩