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What (who) is crystal axis - definition
![β-quartz]], [[tridymite]], [[cristobalite]], [[coesite]], and [[stishovite]].](https://commons.wikimedia.org/wiki/Special:FilePath/Quartz, Tibet.jpg?width=200 "β-quartz]], [[tridymite]], [[cristobalite]], [[coesite]], and [[stishovite]].")
![The [[Boerdijk–Coxeter helix]] is an example of a screw axis symmetry that is nonperiodic.](https://commons.wikimedia.org/wiki/Special:FilePath/Coxeter helix.png?width=200 "The [[Boerdijk–Coxeter helix]] is an example of a screw axis symmetry that is nonperiodic.")
![3<sub>1</sub> screw axis in crystal structure of [[tellurium]]](https://commons.wikimedia.org/wiki/Special:FilePath/Te chains.png?width=200 "3<sub>1</sub> screw axis in crystal structure of [[tellurium]]")
Wikipedia
In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions, or molecules in a crystalline material. Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns that repeat along the principal directions of three-dimensional space in matter.
The smallest group of particles in the material that constitutes this repeating pattern is the unit cell of the structure. The unit cell completely reflects the symmetry and structure of the entire crystal, which is built up by repetitive translation of the unit cell along its principal axes. The translation vectors define the nodes of the Bravais lattice.
The lengths of the principal axes, or edges, of the unit cell and the angles between them are the lattice constants, also called lattice parameters or cell parameters. The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space may be described by the 230 space groups.
The crystal structure and symmetry play a critical role in determining many physical properties, such as cleavage, electronic band structure, and optical transparency.
