The History and Folklore of Rock Crystals

The popular belief in his time as to the origin of rock-crystal is voiced by St. Jerome, when, using the words of Pliny, although not citing his authority, he says that it was formed by the congelation of water in dark caverns of the mountains, where the temperature was intensely cold, so that, "While a stone to the touch, it seems like water to the eye." This belief was evidently due to the fact that rock-crystal was so often found in mountain clefts and caverns. Symbolically, it signified that those within the portals of the Church should keep themselves free from stain and have a pure faith. (Sancti Eusebii Hieronymi "Opera Omnia," ed. Migne, vol. iv, Parisiis, 1865, col. 545.)

The Chinese emperor Wu was devoted to the service of the gods and of the immortal spirits. He built many edifices for religious purposes, and all the doors of these buildings were made of white rock-crystal, so that a flood of light poured into the interior. Although the Chinese texts call this material rock-crystal, it is possible that the name was applied to glass when that substance was but recently introduced into China. (Pfizmeier, "Beitrage zur Geschichte der Edelsteinen und des Goldes," Sitzungsbericht d. phil. hist. Kl., Wien, vol. lviii, 1868.)

Regarding this same "rock-crystal" a humorous tale is related. Muan-fen, a mandarin who had a great terror of draughts, was once received in the palace by one of the Chinese emperors. The doors of the audience chamber were of rock-crystal and were tightly closed, but, because of the transparency of the material, they seemed to be wide open, and the emperor was greatly amused to note that Muan-fen was shivering with cold, although the temperature of the room was quite comfortable. (Pfizmeier, l. c.)