Shale block

Shale would replace Stone in the ground underneath mangrove swamps. As sandstone occupies a layer between sand and sandstone, Shale would occupy a space between Mud and Stone. Mud would also be moved down to occupy all layers of dirt in a swamp instead of the surface.

Obtaining: As for obtaining shale, it would be found generating in Mangrove Swamps and could be bought from Mason villagers. It could be mined with a pickaxe, either dropping itself or shards/fragments/shingles (which could be used to craft shale). Mining with silk touch would make a shale block drop itself.

Useage: Shale would have smooth, chiseled (with a witch engraved on the sides of the block), cut, and polished variants, as well as the ability to be made into stairs, slabs, walls, and other partial blocks.

Appeareance: Shale would serve as another building block and come in three colors: Shale (a grey color), brown shale (a yellow brown color), and dark shale (a black color). The top and bottom of the block would be smooth with a few crack-like marks on it, and the sides would have several parallel horizontal bands, resembling its layered, chipped appearance.

Notes: Shale is the compressed remains of fossilized mud