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.

{| cellpadding=5 border=1 | simple orthorhombic | base-centered
orthorhombic | body-centered
orthorhombic | face-centered
orthorhombic |- || || || || |}

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.

{| cellpadding=8 |name |international |Schoenflies |example |- |orthorhombic bipyramidal | |D_2h |sulfur |- |orthorhombic pyramidal | | C_2v | |- |orthorhombic sphenoidal | |D₂ | |}