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Definition of crystal system in English: crystal systemnoun Each of seven categories of crystals (cubic, tetragonal, orthorhombic, trigonal, hexagonal, monoclinic, and triclinic) classified according to the possible relations of the crystal axes. 晶系（共七类） Example sentencesExamples - Each mineral is carefully assigned a ‘Dana’ number followed by the accepted name, chemical formula, crystal system, and space group.
- There are only fourteen distinct types of Bravais lattices, and these are associated with seven crystal systems.
- Fundamental text for each mineral includes such information as varieties and colors, crystal system and mineral group, composition, characteristic identifying features, size, and distribution.
- All of the forms in the isometric crystal system completely enclose space, making them regular geometric solids.
Definition of crystal system in US English: crystal systemnoun Each of seven categories of crystals (cubic, tetragonal, orthorhombic, trigonal, hexagonal, monoclinic, and triclinic) classified according to the possible relations of the crystal axes. 晶系（共七类） Example sentencesExamples - There are only fourteen distinct types of Bravais lattices, and these are associated with seven crystal systems.
- Each mineral is carefully assigned a ‘Dana’ number followed by the accepted name, chemical formula, crystal system, and space group.
- Fundamental text for each mineral includes such information as varieties and colors, crystal system and mineral group, composition, characteristic identifying features, size, and distribution.
- All of the forms in the isometric crystal system completely enclose space, making them regular geometric solids.
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