Orthorhombic Crystal System - Crystal Classes

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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