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quartz n.石英

释义2： quartz
/ kwC:ts /

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◙ noun
1. [mass noun] a hard mineral consisting of silica, found widely in igneous and metamorphic rocks and typically occurring as colourless or white hexagonal prisms. It is often coloured by impurities (as in amethyst, citrine, and cairngorm)
• 石英1. mid 18th cent.: from German Quarz, from Polish dialect kwardy, corresponding to Czech tvrdý 'hard'

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