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Crossword clue: an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles

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an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles

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A semipellucid, uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds.