(n.) A variety of chalcedony, of a clear, deep red, flesh red, or reddish white color. It is moderately hard, capable of a good polish, and often used for seals.
Example Sentences:
(1) From the Carnelian seal-stone of the Vehdin-Shapur to a 20th-century squirrel parka worn by the Yup’ik of Alaska , the British Museum and Google have announced details of a digital partnership allowing people to view in detail nearly 5,000 objects online.
Chalcedony
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.