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