may refer to:
- Crystal , in chemistry and mineralogy, a form of matter wherein its molecules are regularly aggregated in a definite internal crystal structure, with the external form of a solid of symmetrically arranged plane faces
- Liquid Crystal , in physical chemistry, a turbid liquid with some internal structure like an ordinary crystal, that exhibits double refraction
- Lead Crystal (most often referred to as simply "crystal") is glass that has had lead oxide added to it. This increases its index of refraction giving it a much greater "sparkle" than regular glass.
- In electronics, a crystal is a crystalline piece of a semiconductor used in a device, such as a Crystal Radio Receiver , for its properties of electrical conduction
- Crystal Oscillator , in electronics, a device, often used in timekeeping, as in a quartz clock, and in radio transmission, which produces an alternating electric current stabilized by the mechanical resonance of a piezoelectric crystal, usually quartz
- Lead Crystal or crystal-glass, a form of glass with a high degree of transparency that usually consists of a high proportion of lead oxide
- A crystal can also refer to a piece of rock-crystal (or similar material) used especially in magic art, such as Crystal Gazing
- The Crystals , a popular American "girl group" of the 1960s, best known for songs like ''He's a Rebel'' and ''Uptown''
- Crystal (comics) , a superhero in the fictional Marvel Comics universe
- Crystal (song) , a record released by British band ''New Order'' in 2001
- Slang for crystalline Methamphetamine
- Crystal Healing , belief in healing or metaphysical power of crystals
- Crystal, Maine
- Crystal, Minnesota , a town in Hennepin County
- Crystal, New Mexico , a Census-designated place in San Juan County
- Crystal, North Dakota a town in Pembina County
- Crystal, Nevada , a Census-designated place in Nye County
- Crystal Lake (disambiguation)
- Crystal Township, Oceana County, Michigan
- Crystal Township, Montcalm County, Michigan
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