Orthorhombic
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, which is different from a) and height (c, which is different from a and b). 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-centered
orthorhombic
| body-centered
orthorhombic
| face-centered
orthorhombic
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The point groups (or crystal classes) that fall under this crystal system are listed below, followed by their representations in international notation and Schoenflies notation, and mineral examples.
| name
| international
| Schoenflies
| example
|
| orthorhombic bipyramidal
| <math>\frac2m \frac2m \frac2m<math>
| D2h
| sulfur
|
| orthorhombic pyramidal
| <math>2mm<math>
| C2v
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| orthorhombic sphenoidal
| <math>222<math>
| D2
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