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