Brazil is the largest exporter of radio and radar quality quartz crystals... no where else on earth has the same quality and quantity of quartz crystals. During the second world war Arkansas was the only US State to have the quality needed, but it could not produce the quantity required. Importation of Brazilian quartz was vital to the war effort. There were so many German U-boats patrolling the waters of the Atlantic, Caribbean and Gulf of Mexico after the bombing of Pearl Harbor that the supply was cut off by sea, but not by air.
My research suggests that the normal resonant mechanical vibrations of quartz crystal controls the radio frequency of a circuit... man enhanced this feature by cutting and orienting the quartz in a specific way.
Crystals technology is utilized in a multitude of products today... from the military to alternative healing practices.
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10x10 oil on canvas