We do granite countertops in a lot of Pantries as well as Butler's Pantries.
Usually the stone is the same as whatever the homeowner is using in the Kitchen. Not always though. You can definitely mix it up!
Here are some pictures of Pantries that I found on Houzz that have stone countertops...
contemporary kitchen design by san francisco general contractor Bill Fry Construction - Wm. H. Fry Const. Co.