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Simpson
Not a fire expert, but there were cracks in the back of all the fireplaces in my folks old house which had no central heating - ie lots of fires. Pretty sure it's a product of heat + stone.
Never any issues, although they did get them patched eventually when there was work to the rest of it. But these were solid chalk(?) stone things, so could well be softer.
They always had a caste iron fire plate at the back. Protects the stone and helps with heat.