Emily Dickinson Lexicon

CHAL-CED'O-NY, n. [from Chalcedon, a town in Asia Minor, opposite to Byzantium, now Constantinople. Pliny informs us that Chalcedon signifies the town of blind men. The last syllable then is the Celtic dun, English town, a fact that the historian should not overlook. Plin. lib. 5. 32.]

A subspecies of quartz, a mineral called also white agate, resembling milk diluted with water, and more or less clouded or opake, with veins, circles and spots. It is used in jewelry. – Cleaveland. Nicholson. Encyc. The varieties of chalcedony are common chalcedony, heliotrope, chrysoprase, plasma, onyx, sard, and sardonyx. – Ure.