Crystals

noun

1. A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.
2. A piece of glimmering, shining mineral resembling ice or glass.
3. A fine type of glassware, or the material used to make it.
4. Crystal meth: methamphetamine hydrochloride.
5. The glass over the dial of a watch case.