Crystal Classes
The orthorhombic crystal system class names, examples, Schönflies notation, Hermann-Mauguin notation, point groups, International Tables for Crystallography space group number, orbifold, type, and space groups are listed in the table below.
| # | Point group | Example | Type | Space groups | ||||
|---|---|---|---|---|---|---|---|---|
| Name | Schönflies | Intl | Orbifold | Coxeter | ||||
| 16-24 | sphenoidal | D2 | 222 | 222 | + | epsomite | enantiomorphic | P222, P2221, P21212, P212121, C2221, C222, F222, I222, I212121 |
| 25-46 | pyramidal | C2v | mm2 | *22 | 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 | D2h | mmm | *222 | olivine, aragonite, marcasite | centrosymmetric | Pmmm, Pnnn, Pccm, Pban, Pmma, Pnna, Pmna, Pcca, Pbam, Pccn, Pbcm, Pnnm, Pmmn, Pbcn, Pbca, Pnma, Cmcm, Cmca, Cmmm, Cccm, Cmme, Ccce, Fmmm, Fddd, Immm, Ibam, Ibca, Imma | |
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—John Kenneth Galbraith (b. 1908)
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