Could a being made mostly of rock exist with any possible circumstances?

In some science fiction and fantasy settings (mostly fantasy) there are sometimes things like rock giants or rock golems. Basically, what I'm getting at is rocks forms with, sentience in some cases. So I was wondering if it is at all feasible for beings like this to evolve into human like creatures. They do not need to be made entirely of rock, I suppose, but how far from rock would they have to be? How would their bodies be able to function if it was possible?

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Could a being made mostly of rock exist with any possible circumstances?

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