Consider that granite contains quartz. Quartz under pressure causes electrical currents and other minerals have a property known as triboluminescence (sciencing.com). It's not unreasonable to imagine there are communications properties that exist besides iPhones.
Consider that granite contains quartz. [Quartz under pressure causes electrical currents and other minerals have a property known as triboluminescence](https://sciencing.com/make-electricity-quartz-diamonds-6456846.html). It's not unreasonable to imagine there are communications properties that exist besides iPhones.
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