Relating to or composed of chalcedony, a translucent form of quartz that often has a waxy or glassy luster.
From Greek 'Chalkēdōn' (Chalcedon) + '-ic'. The suffix shows the gemstone was named after the ancient city where it was widely traded.
Chalcedonic stones were so valuable that the ancient city Chalcedon became synonymous with the gem itself—it's like how 'champagne' comes from the French region, not from the method!
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