Orthorhombic crystal system

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File:Aragonit,8 Maroko.jpg
An example of the orthorhombic crystals, aragonite

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-centered
Orthohombic, simple Orthohombic, base-centered Orthohombic, body-centered Orthohombic, face-centered

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 C2v hemimorphite, bertrandite
orthorhombic sphenoidal D2 epsomite

See also


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

de:Orthorhombisches Kristallsystem et:Rombiline süngoonia ko:사방정계 sk:Rombická sústava sr:Ромбична кристална система sv:Ortorombiska kristallsystemet uk:Ромбічна сингонія