Do I take it you mean graphite? - I don't think granite is significantly conductive.... not welingtons as granite is added to mix to reduce static, and try holding the line wire.
All true, but you won't find capacitive (or inductive) paths of sufficiently low reactance to present a hazard and, in many cases, not enough enough to feel anything at all.However it is the very being in a laboratory which means the results are not valid. Around the home we have loads of items linked with inductive or capacitive bonds which you can't emulate in a laboratory...
Kind Regards, John
Edit: typo corrected
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