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Are the rocks composed entirely of quartz or are there just quartz crystals in there?
Quartz is a very unusual substance,if you make it vibrate it produces an electric current and conversely if you subject it to electricity it vibrates (the "pick-up" on most accoustic guitars is based on this principal).
If the stones are huge then maybe Andy you could persuade Nick Turner and Hawkwind to do a gig there.
Go to it.
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