In an easy to spot case of movement and separation between a fireplace hearth and the building floor take a look at the white caulk installed in an open crack between the hearth face and the floor in our photo left.
Repair cracked granite hearth.
Repair may be a moderately difficult thing since you really need to eliminate the underlying problem.
The crack will just reappear.
I work for a granite company never recommend marble as a hearth stone.
Caulk is not a safe repair for hearth settlement.
Simply slapping some mortar on the crack will not solve a thing even if you bother to find some heat resistant mortar.
You will need no more than 2 teaspoons of granite powder to repair most cracks under 1 foot 0 30 m long.
Properly installed granite countertops are not likely to crack but if they do there are steps you can take to repair them.
Best granite marble quartz repair ever with instantbond super glue adhesive how t.
Granite countertops are relatively easy to take care of and such preventive maintenance as cleaning up spills quickly and avoiding setting hot pots on them will keep the surface in good repair.
Fissures are lines formed in the pattern of the stone by the borders of various crystalline groups within the stone.
Again i d suggest contacting a good mason who understands fireplaces and foundations.
If you have an extra piece of the counter top material you can use this.
Fissure any discussion of cracks in granite countertops must also include an explanation of fissures.
Connie phillips above has the best idea i have seen so far.
Long or full thickness cracks and or areas with multiple cracks likely need repair.