Has anyone done any research into quartz capstones, possibly used for communications in ancient times? I live near King Arthurs Stone on Gower and have become intrigued as to why Quartz was used.

Quartz actually resonates at the same frequency (7-8hz) as both the human body and the earths crust (as this is made up of quartz too). It can be used to make electricity and regulate machinery such as clocks and computers and also to transmit and receive signals.

Any info would be much appreciated...