Given that pillow lavas can be recognised in some eclogite facies rocks, I think a porcelain toilet would stand a good chance of remaining recognisable at all t

Given that pillow lavas can be recognised in some eclogite facies rocks, I think a porcelain toilet would stand a good chance of remaining recognisable at all the way to granulite or eclogite facies, as long as it is not too deformed.