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chalcedony (n.)

semi-precious stone, a cloudy white variety of quartz, c. 1300, from Latin calcedonius, a Vulgate rendering of Greek khalkedon in Revelations xxi.19; found nowhere else. "The word is of very complicated history" [OED]. Connection with Chalcedon in Asia Minor "is very doubtful" [OED].

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Definitions of chalcedony from WordNet

chalcedony (n.)
a milky or greyish translucent to transparent quartz;
Synonyms: calcedony
From wordnet.princeton.edu