Crystal System

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crystal system

[¦krist·əl ′sis·təm]
(crystallography)
One of seven categories (cubic, hexagonal, tetragonal, trigonal, orthorhombic, monoclinic, and triclinic) into which a crystal may be classified according to the shape of the unit cell of its Bravais lattice, or according to the dominant symmetry elements of its crystal class.

Crystal System

 

any of the seven groups of crystals obtained when a classification is made according to the symmetry of the unit cell. A system is characterized by the ratios between the a, b, and c axes and by the angles α, β, and γ of the unit cell. The seven systems are cubic (a = b = c; α = β = γ = 90°), tetragonal (a = bc; α = β = γ = 90°), hexagonal (a = bc; α = β = 90°; γ = 120°), trigonal (a = b = c; α = β = γ ≠ 90°), orthorhombic (abc; α = β = γ = 90°), mono-clinic (abc; α = β = γ = 90°; β ≠ 90°), and triclinic (abc; αβγ ≠ 90°). As the broadest classification of crystal symmetry, each crystal system includes several symmetry point groups and Bravais lattices.

REFERENCE

Popov, G. M., and I. I. Shafranovskii. Kristallografiia, 5th ed. Moscow, 1972.
References in periodicals archive ?
Seven possible syngonies that describe 7 crystal systems are shown in Table 1 [14].
(c) There are seven possible crystal systems, each of which defines a class of point groups.
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In this text, Broer (chemistry, Eindhoven University of Technology, Netherlands) has assembled contributions on the latest applications and research in the field of liquid crystal systems from scientists specializing in a variety of disciplines.
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