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Word | Obsidian |
acid or granitic glass; usually dark, but transparent in thin pieces / acid or granitic glass formed by the rapid cooling of lava without crystallization / A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters. / black volcanic rock / a hard, dark, glasslike volcanic rock formed by the rapid solidification of lava without crystallization. / a dark natural glass that forms when lava cools, | |
Usage | ⇒ The deposits of obsidian on the mountain slopes were an indication that the volcano had erupted in ancient times. ⇒ Hard stones such as obsidian and rock crystal were added to the repertoire of the stone-vase maker. |
Synonyms | alabaster, lava, mineral, stone, aragonite, asbestos, azurite, barite, basalt, bauxite, black, boron, brimstone, brookite, calcite, carbon, chalcedony, asphalt, cobalt, coke, |
Antonyms | |
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