2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Hyalite \Hy"a*lite\, n. [Gr. "y`alos glass: cf. F. hyalite.] (Min.) A pellucid variety of opal in globules looking like colorless gum or resin; -- called also {M["u]ller's glass}. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: 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]
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