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 | |
Read more about this topic: Orthorhombic Crystal System
Famous quotes containing the words crystal and/or classes:
“I waited alone, in the company of orchids, roses and violets who—like people waiting beside you, but to whom you are unknown—maintained a silence which their individuality of living things rendered more imposing and in their chilly manner received the heat from an incandescent coal fire, preciously placed behind a crystal glass, in a white marble tub where it dropped, from time to time, its dangerous rubies.”
—Marcel Proust (1871–1922)
“There are two classes of men called poets. The one cultivates life, the other art,... one satisfies hunger, the other gratifies the palate.”
—Henry David Thoreau (1817–1862)