Thank you for your inquiry into this Horseshoe Bay area home by Zbranek & Holt, I don't have ready access to this information but am trying to find out for you. Are you speaking about the tub decking? The walls are all travertine stone. I will try to find out what the slab is for the decking and post back to you. Thank you ~ Team ZHCH

Diane - this is Breccia Sarda marble on tub decking. We advise clients not to use any harsh or abrasive chemicals cleaners/soaps/hairspray. Instead use a natural stone cleaner or a mild soap and water that contains no “lemon juice/citrus.” Hope this answers all your questions ~ Team ZHCH

Thank you!