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# Orthorhombic crystal system

In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups. Orthorhombic lattices result from stretching a cubic lattice along two of its lattice vectors by two different factors, resulting in a rectangular prism with a rectangular base (a by b) and height (c), such that abc. All three bases intersect at 90° angles. The three lattice vectors remain mutually orthogonal.

There are four orthorhombic Bravais lattices: simple orthorhombic, base-centered orthorhombic, body-centered orthorhombic, and face-centered orthorhombic.

 simple orthorhombic base-centeredorthorhombic body-centeredorthorhombic face-centeredorthorhombic

The point groups (or crystal classes) that fall under this crystal system are listed below, followed by their representations in International {Hermann-Mauguin) notation and Schoenflies notation, and mineral examples.

NameInternationalSchoenfliesExample
orthorhombic bipyramidal $\frac2mmm$ D2h sulfur, olivine, aragonite
orthorhombic pyramidal 2mm C2v hemimorphite, bertrandite
orthorhombic sphenoidal 222 D2 epsomite