Impure form of quartz, used as a gemstone - Crossword Clue

Below are possible answers for the crossword clue Impure form of quartz, used as a gemstone.

5 letter answer(s) to impure form of quartz, used as a gemstone

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

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