Chalcedony

[kalcedony]. A precious stone, consisting of half-transparent quartz: so called from Chalcedon, in Asia Minor, where it was first found. Its chief varieties are agate, carnelian, cat's-eye, chrysoprase, flint, hornstone, onyx, plasma, and sard.

Albertus Magnus (book i. chap. 2) says: “It dispels illusions and all vain imaginations. If hung about the neck as a charm, it is a defence against enemies, and keeps the body healthful and vigorous.”

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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