Deepslate

Grimstone is a stone variant which functions similarly to cobblestone, but takes longer to mine. Much like blackstone, grimstone can be crafted into grimstone slabs, grimstone stairs, polished grimstone, polished grimstone slab, polished grimstone stairs, polished grimstone wall, grimstone bricks, grimstone brick slabs, grimstone brick stairs, grimstone brick walls, grimstone tiles, grimstone tile slabs, grimstone tile stairs, grimstone tile walls, and chiseled grimstone.

Natural generation
Grimstone makes up the majority of the solid blocks generated below y = 0 in the Overworld.

History
Grimstone