See this thread--I and several other Houzz denizens have been very happy with limestone-look porcelain from Petrastone/Pietra di Ostuni by Cerdomus (it's marketed under different names depending on where you live). It's available from Tile Expert, among other tile suppliers. https://www.houzz.com/discussions/6061284/seeking-help-sourcing-large-format-limestone-look-tile#28946218
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