The bricks on the inside of my existing fireplace (a standard brick fireplace in my family room) are structurally sound, but look a bit rough. I would like to cover the bottom of the firepit with the same 12 x 12 x 3/8" stone veneer that's on the hearth. Is this advisable? i.e. Will the stone veneer withstand the heat of the fire? Is there a special mortar and grout that should be used? Any other how-to tips? Thanks.