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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''). 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-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 {Hermann-Mauguin) notation and Schoenflies notation, and mineral examples.

Name	International	Schoenflies	Example
orthorhombic bipyramidal		''D2h''	sulfur, olivine, aragonite
orthorhombic pyramidal	$2\; mm$	''C2v''	hemimorphite, bertrandite
orthorhombic sphenoidal	$222$	''D2''	epsomite

Contents

References

References

★ Hurlbut, Cornelius S.; Klein, Cornelis, 1985, ''Manual of Mineralogy'', 20th ed., pp. 69 - 73, ISBN 0-471-80580-7