Resembling or containing chalcedony; having the appearance or properties of the translucent quartz gemstone.
From Greek 'Chalkēdōn' + '-ous' (full of, resembling). The suffix indicates a characteristic or composition.
A chalcedonous rock might look like it's made of chalcedony but could have a slightly different chemical makeup—geology is full of these 'close relatives' that look nearly identical but aren't quite the same thing!
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