What's the difference between calcedony and chalcedony?

Calcedony

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Definition:

Example Sentences:

Chalcedony

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Definition:

• (n.) A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.

Example Sentences:

• (1) The free silicic oxide is presented by low-temperature crystobalite and quartz, more rarely opal and chalcedony.