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cacholong 美蛋白石 美蛋白石 Opal \ O" pal\, n. [ L. opalus: cf. Gr. ?, Skr. upala a rock, stone, precious stone: cf. F. opale.] ( Min.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. [ 1913 Webster] Note: The { precious opal} presents a peculiar play of colors of delicate tints, and is highly esteemed as a gem. One kind, with a varied play of color in a reddish ground, is called the { harlequin opal}. The { fire opal} has colors like the red and yellow of flame. { Common opal} has a milky appearance. { Menilite} is a brown impure variety, occurring in concretions at Menilmontant, near Paris. Other varieties are { cacholong}, { girasol}, { hyalite}, and { geyserite}. [ 1913 Webster]
Cacholong \ Cach" o* long\, n. [ F. cacholong, said to be from Cach, the name of a river in Bucharia cholon, a Calmuck word for stone; or fr. a Calmuck word meaning " beautiful stone"] ( Min.) An opaque or milk- white chalcedony, a variety of quartz; also, a similar variety of opal. [ 1913 Webster]
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