crystal system

noun Crystallography.
any of the six main classifications of crystals and of crystal lattices according to their symmetry: isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
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crystal system
 
n
crystallog See also crystal class any of six, or sometimes seven, classifications of crystals depending on their symmetry. The classes are cubic, tetragonal, hexagonal, orthorhombic, monoclinic, and triclinic. Sometimes an additional system, trigonal, is distinguished, although this is usually included in the hexagonal system

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Example sentences
The unit cell arrangement of the atoms within a crystal system gives the structure.
Referring to a rhombohedron, which is a common crystal form in the hexagonal crystal system.
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