Tuff

Tuff is an ornamental rock formed from volcanic ash, occurring in underground blobs below Y=0.

Natural generation
Tuff can generate in the Overworld in the form of blobs. Tuff attempts to generate 2 times per chunk in blobs of size 0-862, from elevations -63 to 0, in all biomes. Additionally, tuff can generate in an ore vein that consists of iron ore below Y=0.

Tuff can replace stone, diorite, andesite, granite, and deepslate. Any ore that generates in tuff becomes its deepslate variety. Tuff also generates occasionally in the deepslate layer below Y=0.

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

Usage
Tuff is currently used only for decoration. It cannot be crafted into anything else.

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Trivia

 * In real life, tuff is a strong type of igneous rock which forms from compressed ash resulting from volcanic eruptions, which sees extensive use in Armenian architecture. Tuff in Minecraft is somewhat similar, with the texture representing that of a rough, uneven surface which appears to be the result of volcanic ash formation.