Mick Harper wrote: Bit of a long shot but at least and at last we have a hypothesis for why the Megalithics built flat-top causewayed islands (jelly-moulds) eg Jethou (pic, please). If these glow in some fashion then they would make ideal navigational beacons. Presumably the tidal element is necessary to re-charge them.
While some researchers refer to the object as a battery, the origin and purpose of the object remains unclear. In March 2012, Professor Elizabeth Stone, of Stony Brook University, an expert on Iraqi archaeology, returning from the first archaeological expedition in Iraq after 20 years, stated that she does not know a single archaeologist who believed that these were batteries.
Sorry to burst your jelly-mould bubble, but if you want rechargeable battery islands, you have to pay extra. Or use a different method. Piezoelectric hills would work best in dry conditions, not beside the seaside beside the sea.
Boreades wrote: I've just remembered Saint-Paul-la-Roche. Friends near Thiviers took me there. It's a huge hill in France, made of white quartz. You can pick up huge chunks of it by the roadside.
An oddity is the massive quartz outcrop near La Roche which has been completely quarried by now. This very pure, milky exsudation quartz was once sought after by NASA for optical devices (lenses etc.). Under magnification one can observe many parallel shear planes of tectonic origin. The quarry once contained single quartz crystals in the decimeter and meter range.
https://en.wikipedia.org/wiki/Saint-Pau ... he#Geology
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