Thesaurus: opal

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Definitions

1. n. A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
2. n. a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
3. A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. 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.
4. A mineral consisting, like quartz, of silica, but inferior toquartz in hardness and specific gravity.
5. n:100 n. a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones