Wiktionary
n. (cx crystallography English) Any of the seven distinct symmetry classifications of crystals :- cubic, tetragonal, hexagonal, orthorhombic, monoclinic, triclinic and trigonal.
Wikipedia
In crystallography, the terms crystal system, crystal family, and lattice system each refer to one of several classes of space groups, lattices, point groups, or crystals. Informally, two crystals tend to be in the same crystal system if they have similar symmetries, though there are many exceptions to this.
Crystal systems, crystal families, and lattice systems are similar but slightly different, and there is widespread confusion between them: in particular the trigonal crystal system is often confused with the rhombohedral lattice system, and the term "crystal system" is sometimes used to mean "lattice system" or "crystal family".
Space groups and crystals are divided into seven crystal systems according to their point groups, and into seven lattice systems according to their Bravais lattices. Five of the crystal systems are essentially the same as five of the lattice systems, but the hexagonal and trigonal crystal systems differ from the hexagonal and rhombohedral lattice systems. The six crystal families are formed by combining the hexagonal and trigonal crystal systems into one hexagonal family, in order to eliminate this confusion.
Usage examples of "crystal system".
But with no Drive-crystal system, it was limited to HypoSpeed velocities.
Feeling a little guilty about missing the battles that were sure to come on the morrowespecially with Ursis's new crystal system working so wellhe messaged his availability, and turned in early.
It was alive with internal fires and the crystal system, such as he could tell from its rounded, worn form, was distinctly not that of quartz.