Looked at some related gubbins on the net, and apparently for piezoelectricity to occur, the crystalline formation needs to be irregular and completely assymetrical - what better shape than a natural 'lith or a large quartz deposit ?
Triboluminescence is the effect of light produced while striking or rubbing together to pieces odf material. From Greek "tribein" - to rub and latin prefix "lumein" - light.
The spectrum of light produced in this way from sugar, is the same a lightening :-s Weird.
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