a small fragment of something broken off from the whole | a protective cover that protects the face of a watch |
a person with an unusual or odd personality | glassware made of quartz |
a crystal of snow | 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 |
| a solid formed by the solidification of a chemical and having a highly regular atomic structure |
| colorless glass made of almost pure silica |