How do I get dark Scoria and Weathered Limestone? Does it generate in world as well?

PS: There are two versions of the default scoria stone. "scoria" and "natural_scoria". The "natural_scoria" stone has the wg_stone tag for TerraForged world gen but none of the forge:stone tags and "scoria" doesn't have the wg_stone tag.

weathered limestone can be achieved by washing limestone. i dont remember dark scoria

I now also found Weathered Limestone generating in world, but not Dark Scoria.

Dark scoria is meant to be obtained through crafting. The recipe was missing in 1.15 up until 0.2.4d