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Orthorhombic
Introduction
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 a ≠ b ≠ c. 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 |
| 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 | <math>\frac2mmm</math> | D2h | sulfur, olivine, aragonite |
| orthorhombic pyramidal | <math>2 mm</math> | C2v | hemimorphite, bertrandite |
| orthorhombic sphenoidal | <math>222</math> | D2 | epsomite |
References
References
- 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