How to unglue sink that was siliconed on a granit counter

You can't "unglue" silicone. Typically you use a razor blade or other very thin cutter to separate the sink from the countertop. This is an undermount sink?

They do have solvents out there. Here's a link to check them out. Google Good luck, Tom

I wouldn't use a solvent on this... just use a sharp knife (utlity knife) to score the silicone and a 5 in 1 tool (see image) or a putty knife and pry the sink from the silicone like Brain suggested.

Good luck!

Mark