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nouncolorless glass made of almost pure silica
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nouna protective cover that protects the face of a watch
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nouna rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
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nouna crystalline element used as a component in various electronic devices
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nouna solid formed by the solidification of a chemical and having a highly regular atomic structuretype of:
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nounglassware made of quartz
Explanation of crystal
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