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.
Photonic crystals or phononic crystals: in analogy with atomic crystals, regular arrangements of optical or elastic materials, respectively.
Liquid crystal, in physical chemistry, a turbid liquid with some internal structure like an ordinary crystal, that exhibits double refraction.
Technology
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.
Art
A piece of rock-crystal (or similar material) used especially in magic art, such as crystal gazing.
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