I only have a 22 inch depth ledge to place a wood burning stove, and I'm looking to put a heavy natural stone down that extends past the ledge a little bit to give me more room, and be something that looks amazing. The stone I want would ideally be about 4 inches thick, 36-48 inches wide, but I'm not sure what type of stones are better suited for heat. Please let me know what a good option would be.