Yes but it is not stone. If it gets cold, it is very hard and cracks easily. If it gets hot, it is very sticky. The bees use it to seal up cracks in the hive, to coat rough wood and to seal up bugs or anything that dies in the hive that they cannot move out of the hive. SHB die on top of my STB, they starve to death or they are killed by the spiders that I leave in the STB. If I do not remove them within a day or so, the bees will propolis them right thorough the screen and they will be stuck onto the screen.