The resin tops look, to me at least, like stone. They are very heavy, black, and cold to the touch. You might be able to chip off a hidden corner and see what it looks like at a broken edge. They're probably more reslient, that is less brittle, than stone. I thought we cut some with a circular saw using a non-diamond blade, but I could be wrong about that. I do think the last poster was right about the Hg. If the tops are that new, it is unlikely they ever saw mercury.
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