Crystal System

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crystal system

[¦krist·əl ′sis·təm]
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.


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.
It was the only one cubic crystal system of the AgSb[S.sub.2] phase [5] with no impurity detection.
Tom Gutierrez, GT Solar's president and CEO said, 'Crystal Systems' sapphire process knowledge complements our expertise in silicon growth technologies and we believe this combination will allow us to quickly deliver products that leapfrog sapphire crystallisation technology available from other suppliers.'
As part of the deal, Crystal Systems' founder Fred Schmid will join GT Solar.
The Japanese company Crystal Systems Inc has received a contract award for a mirror furnace system from FRIT (the instruments team of the Danish research councils).
In two and three dimensions the number of crystal systems, point groups, and plane or space groups were all enumerated.
In the x-ray diffractometry segment, growth primarily lies in single crystal systems because of their proteomic applications.
Anglo-Dutch systems integrator CMG Plc has signed a deal with Crystal Systems Solutions to offer the Herzliya, Israel-based company's conversion tool as part of its services offering in the European market.
Most of those charges and the bulk of the layoffs will occur at the former Crystal Systems plant in Salem, MA - the very company GTAT acquired in 2010 to get the sapphire technology that led to the Apple deal.
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.
Then comes a few more pages on mineralogical basics (the crystal systems, crystal habits, the Mohs scale, etc.).