The plural form of chalcedony; multiple pieces or varieties of the translucent, waxy-looking quartz gemstone.
From Greek 'Chalkēdōn' (Chalcedon, the ancient city) + '-ies' (plural suffix). The singular 'chalcedony' is the more common form.
Different chalcedonies can look wildly different—some are banded like agates, some are almost clear, some are dotted with red, yet they're all the same mineral at the molecular level!
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