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 are in the same crystal system if they have similar symmetries, although 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.




Class 1 H121 P060 Q317 V301 Y790 Z647 Z971
Class 2 C125 D364 D382 G024 I182 N766 R943
Class 3 C247 L477 M267 N968 O477 O883 X702
Class 4 E175 M609 O128 T405 X877 Y683 Z457
Class 5 H296 H900 L614 M555 N062 N432 N770 V911
Class 6 A982 B041 R474 S804 U319 U574 V753 W237

Known Space Designation
High Sec A641 B274 B449 B520 D792 D845 N110 S047
Low Sec A239 C140 C391 J244 N290 N944 R051 U210
Null Sec C248 E545 K329 K346 S199 V283 Z060 Z142


Wormhole Gate collapse times
not yet begun more than 24 hours
beginning to decay between 24 and 4 hours
reaching the end less than 4 hours
on the verge minutes

Special Designation
M001, Q003, Z006, C008, L005, E004