Orthorhombic crystal system: Difference between revisions
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==Crystal Classes== |
==Crystal Classes== |
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The ''orthorhombic crystal system'' class names, examples, |
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The ''orthorhombic crystal system'' class names, examples, [[Schönflies notation]], [[Hermann-Mauguin notation]], [[crystallographic point group|point groups]], International Tables for Crystallography space group number,<ref name="ITC">{{cite book |title=International Tables for Crystallography |doi=10.1107/97809553602060000001 |isbn=978-1-4020-4969-9 |editor-first=E. |editor-last=Prince |year=2006 |publisher= International Union of Crystallography}}</ref> [[orbifold]], type, and [[space groups]] are listed in the table below. |
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{| class=wikitable |
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|- align=center |
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! rowspan=2 width=50|# |
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! colspan=5|Point group |
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! rowspan=2|Example |
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! rowspan=2|Type |
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! rowspan=2|[[Space group]]s |
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|- |
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! Name |
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! [[Schoenflies notation|Schönflies]] |
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! [[Hermann-Mauguin notation|Intl]] |
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! [[Orbifold]] |
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![[Coxeter notation|Coxeter]] |
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|- |
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!16-24 |
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| sphenoidal <ref name="x-name"/> |
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|| D<sub>2</sub> |
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|| 222 |
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|| 222 |
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|| [2,2]<sup>+</sup> |
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|| [[epsomite]] |
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| [[enantiomorphic]] |
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|| P222, P222<sub>1</sub>, P2<sub>1</sub>2<sub>1</sub>2, P2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>, C222<sub>1</sub>, C222, F222, I222, I2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> |
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|- |
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!25-46 |
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| pyramidal <ref name="x-name"/> |
| pyramidal <ref name="x-name"/> |
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|| C<sub>2v</sub> |
|| C<sub>2v</sub> |
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Revision as of 23:18, 19 April 2012
In crystallography, the orthorhombic crystal system is one of the seven lattice point groups. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a rectangular base (a by b) and height (c), such that a, b, and c are distinct. All three bases intersect at 90° angles. The three lattice vectors remain mutually orthogonal.
Bravais Lattices
There are four orthorhombic Bravais lattices: simple orthorhombic, body-centered orthorhombic, base-centered orthorhombic, and face-centered orthorhombic.
| Primitive | Body-centered | Base-centered | Face-centered |
|---|---|---|---|
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Crystal Classes
The orthorhombic crystal system class names, examples, | pyramidal [1] || C2v ||mm2 | *22 || [2] || hemimorphite, bertrandite |polar || Pmm2, Pmc21, Pcc2, Pma2, Pca21, Pnc2, Pmn21, Pba2, Pna21, Pnn2, Cmm2, Cmc21, Ccc2, Amm2, Aem2, Ama2,Aea2, Fmm2, Fdd2, Imm2, Iba2, Ima2 |- ! 47-74 | bipyramidal [1] || D2h || mmm || *222 || [2,2] || olivine, aragonite, marcasite |centrosymmetric || Pmmm, Pnnn, Pccm, Pban, Pmma, Pnna, Pmna, Pcca, Pbam, Pccn, Pbcm, Pnnm, Pmmn, Pbcn, Pbca, Pnma, Cmcm, Cmce, Cmmm, Cccm, Cmme, Ccce, Fmmm, Fddd, Immm, Ibam, Ibca, Imma |}
See also
References
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 69 – 73, ISBN 0-471-80580-7
- ^ a b "The 32 crystal classes". Retrieved 2009-07-08.
| Seven 3D systems |
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| Four 2D systems | |
