ETYM Latin chalcedonius, from Greek Chalkedon Chalcedon, a town in Asia Minor, opposite to Byzantium: cf. calcédoine, Old Eng. calcidoine, casidoyne. Related to Cassidony.
A milky or grayish translucent to transparent quartz; SYN. calcedony.
Blue or gray variety of quartz.
Form of quartz, SiO2, in which the crystals are so fine-grained that they are impossible to distinguish with a microscope (cryptocrystalline). Agate, onyx, and carnelian are gem varieties of chalcedony.
1. Flavoring made from mixed coffee and chocolate.
2. Soft suede glove leather from goatskin.
3. Superior dark coffee made from beans from Arabia.