https://github.com/davepinch/pinchy.cc/blob/master/content/camera-roll/2018/03/2018-03-29-selfie-in-bellingham.md
In the Bronze Age chalcedony was in use in the Mediterranean region; for example, on Minoan Crete at the Palace of Knossos, chalcedony seals have been recovered dating to circa 1800 BC.
