Baking stone cracked, don't do this!
I placed my very hot baking stone to cool on a coaster (room temperature, 30 degrees celsius) that is about 20 cm/8 inches across and 1 cm/half an inch thick made of cork with a plastic centre. Half an hr later, it broke into half - a very neat but sad line across diagonally.
My brother-in-law says it should have been placed on a flat surface. The fact that its weight was not evenly supported as it cooled caused it to crack. Even though the coaster was very thin and quite wide.
has this ever happened to anyone?? if nothing else, don't do what i did!