The tetragonal crystal system is defined by a unit cell shaped like a stretched or elongated cube. In this system, two of the three edges are equal in length, while the third is either longer or shorter. All angles between the edges are 90°, so the cell is still a rectangular prism but with a square base and a different height. The tetragonal system has higher symmetry than monoclinic or orthorhombic systems but less than cubic. Its main symmetry feature is a single four-fold rotational axis alo