hello, we are in the process of having travertine installed in our shower (right in the middle of it) I asked them to put granite on the step of the shower going in as a different look. I saw it in a magazine....Now I'm wondering if what I saw was marble? after the fact... I tried searching for "granite in shower" on your site with no luck. Was this a mistake?? I have bought the products you have suggested for maintaining my shower but now I'm nervous about the granite decision. Please Please give advice. Thank You. Kim