Deepslate

Grimstone is a stone variant that functions similar to cobblestone or blackstone, but it takes longer to mine. Much like blackstone, it can also be used to craft stone tools, furnaces, and brewing stands. Grimstone can also be used as a decorative block being able to be crafted into many different variants.

Natural generation
Grimstone makes up the majority of where bedrock used to be generated below y = 0 in the Overworld.

Usage
Grimstone can be used as a substitute for cobblestone in the deep, as it can be used to craft stone tools, brewing stands, and furnaces. It can also be used to repair stone tools using an anvil. It can also be used to craft polished grimstone and chiseled grimstone.

Trivia

 * Grimstone is a sort of slate.
 * Similar to grass blocks, the orientation of the texture varies depending on the coordinates.

Gallery
Grimmstein Roche sinistre Grimstone