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menilite 硅乳石 矽乳石 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]
Menilite \ Men" i* lite\, n. [ F. m[' e] nilite; -- so called because it is found at M[' e] nilmontant, near Paris.] ( Min.) See { Opal}. [ 1913 Webster]
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