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[n] a protective cover that protects the face of a watch
[n] glassware made of quartz
[n] a crystalline element used as a component in various electronic devices
[n] a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
[n] colorless glass made of almost pure silica
[n] a solid formed by the solidification of a chemical and having a highly regular atomic structure

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