The Curious Lore of Precious Stones / Being a description of their sentiments and folk lore, superstitions, symbolism, mysticism, use in medicine, protection, prevention, religion, and divination. Crystal gazing, birth-stones, lucky stones and talismans, astral, zodiacal, and planetary

by George Frederick Kunz

Chalcedony

An ingenious though far-fetched explanation of the power attributed to chalcedony of driving away phantoms and visions of the night is supplied by Gonelli, writing in 1702. For him the source of this asserted power was to be found in what has been erroneously termed the alkaline quality of the stone. This dissipated the evil humors of the eye, thus removing the diseased condition of that organ which caused the apparitions to be seen.[63] However absurd this explanation may be, it nevertheless shows that the author put little faith in visible ghosts, and rightly enough recognized the purely subjective character of such phenomena.