Limestone Caves would be an underground biome that has speleothems, (stalactites and stalagmites), as well as its own texture variations of the ores that generate. When these ores are mined, they drop the regular item/block, unless Silk Touch is used, in which case you get "Limestone [Type] Ore."
There would be two variations of Limestone Caves, those being "flooded" and "partially flooded," like the one shown in the image.
Limestone can be crafted into Polished Limestone, which can then be used to craft the same stone tools as normal. Or maybe Limestone should just drop Limestone Cobblestone.
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