 Orthorhombic crystal system

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.
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Bravais Lattices
There are four orthorhombic Bravais lattices: simple orthorhombic, basecentered orthorhombic, bodycentered orthorhombic, and facecentered orthorhombic.
Orthorhombic Bravais lattices Primitive Bodycentered Basecentered Facecentered Crystal Classes
The orthorhombic crystal system class names, examples, Schönflies notation, HermannMauguin notation, point groups, International Tables for Crystallography space group number,^{[1]} orbifold, type, and space groups are listed in the table below.
# Point group Example Type Space groups Name Schönflies Intl Orbifold Coxeter 1624 sphenoidal ^{[2]} D_{2} 222 222 [2,2]^{+} epsomite enantiomorphic P222, P222_{1}, P2_{1}2_{1}2, P2_{1}2_{1}2_{1}, C222_{1}, C222, F222, I222, I2_{1}2_{1}2_{1} 2546 pyramidal ^{[2]} C_{2v} mm2 *22 [2] hemimorphite, bertrandite polar Pmm2, Pmc2_{1}, Pcc2, Pma2, Pca2_{1}, Pnc2, Pmn2_{1}, Pba2, Pna2_{1}, Pnn2, Cmm2, Cmc2_{1}, Ccc2, Amm2, Aem2, Ama2,Aea2, Fmm2, Fdd2, Imm2, Iba2, Ima2 4774 bipyramidal ^{[2]} D_{2h} 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 0471805807
 ^ Prince, E., ed (2006). International Tables for Crystallography. International Union of Crystallography. doi:10.1107/97809553602060000001. ISBN 9781402049699.
 ^ ^{a} ^{b} ^{c} "The 32 crystal classes". http://www.cartage.org.lb/en/themes/sciences/physics/SolidStatePhysics/AtomicBonding/CrystalStructure/32Crystal/32Crystal.htm. Retrieved 20090708.
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