n. [ L. opalus: cf. Gr. &unr_;, 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 ]
☞ 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 ]
n. (Min.) A reflection of a milky or pearly light from the interior of a mineral, as in the moonstone; the state or quality of being opalescent. [ 1913 Webster ]
v. t. [ imp. & p. p. Opalized p. pr. & vb. n. Opalizing. ] [ Cf. F. opaliser. ] To convert into opal, or a substance like opal. Lyell. [ 1913 Webster ]
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