I lived in an area where there's lots of bath salt including columns. I was doing a backyard wood fired oven that's going to have Basalt pavers surrounding it for a patio.

I had to move so I never finished it but I saved all my hard to find products including a gigantic slab that's 81 in long and 32 wide it's going to become a food serving and prep area.

The photo are the firebrick, cinder blocks for the slab supports, Chimney bits