Crystal Lab › The 230 space groups › Orthorhombic
No. 62 P n m a
Orthorhombic space group · 8 symmetry operations per cell · 4 Wyckoff positions · 6 settings
Symmetry elements and Wyckoff positions (interactive)
No. 62 P n m a
Setting- Number
- 62
- Hermann–Mauguin symbol
- P n m a
- Hall symbol
-P 2ac 2n- Crystal system
- Orthorhombic
- Operations per cell
- 8
- General position
- 8d (site symmetry 1)
Wyckoff positions (standard setting)
| Multiplicity | Letter | Site symmetry |
|---|---|---|
| 8 | d | 1 |
| 4 | c | .m. |
| 4 | b | -1 |
| 4 | a | -1 |
How to read it
- Each symmetry element drawn in the cell is worked out from the group’s operations: rotation and screw axes as lines (arrow = direction; dashed = screw), mirror and glide planes as sheets (dashed outline = glide), inversion centres as dots; rotoinversion axes are dotted. Colours: 2-fold red, 3-fold green, 4-fold blue, 6-fold purple.
- The multiplicity is how many equivalent points an atom on that site generates in the conventional cell; the general position has the highest multiplicity, equal to the number of operations.
- Site symmetry is the point group that leaves that position fixed; a special position (lower multiplicity) sits on a symmetry element — press + on a row to see its atoms land on the drawn elements.
Crystal Lab structures in this group
- Lithium iron phosphate (olivine) (LiFePO₄) — Olivine-type cathode
- Forsterite (olivine) (Mg₂SiO₄) — Orthosilicate
- LISICON (lithium zinc germanate) (Li₁₄Zn(GeO₄)₄) — Li⁺ conductor (γ-Li₃PO₄ framework)
- MIL-53(Al) (Al(OH)(BDC)) — Flexible metal–organic framework
Prototype structures in this group (113)
Al₂F₂O₄Si S05Ca₂Fe₂O₅F₂Mg₃O₄Si S07Al₂Au₃SrC₂Cr₃ D510K₂Te₃Bi₂Fe₄O₉K₂O₄S H16Mg₂O₄Si S12Fe₂Mg₅O₂₂(OH)₂Si₈ S44Al₂O₅Si S03K₂O₆S₃ K51Er₂F₇KNi₂TaTe₂Cu₂NaO₂Co₂TaTe₂Bi₂PbS₄Ag₂CrO₄B₂CaO₈Si₂ S63C₂MoUO₂SrZnCo₂Si C37Cl₂Hg C25Cl₂Pb C23H₂Sr C29Br₂Sr C53Cs₂SbCl₃H₁₅N₅Rh J18Ni₃Ta₂Te₅Cu₃H₄O₁₀STeS₃Sb₅ D58Ge₃Pt₂S₃Sn₂B₃Ni₄P₃Rh₄Eu₃O₄C₃Cr₇ D101Cl₃CuK₂Br₃CH₆NPbI₃(NH₄) D016Bi₃NiAl₃Ni D020O₃WCl₄H₂K₂OSnCl₄Cs₂CuP₄Se₃Mo₄P₃Ge₄Sm₅Ca₂O₄SiCl₄(H₂O)K₂Sn E35Cl₄(H₂O)K₂SnLi₃PS₄B₄MgAu₄ZrBa₅IrO₁₂Ru₂O₅SVO₆PbV₂O₇Si₂Y₂C₈H₄K₄MoN₈O₂ F21Cl₈OPSbAl₃MnCdP₁₄SnCaH₂₂O₂₃P₂U₂ClCu₂H₂O₃CuFe₂S₃ E9eCdLi₂O₄SiBaMn₂O₆SmBiCl₂CuSeCuS₂Sb F56IrSe₂CuSe₃SrYCdCl₃(NH₄) E24CuS₃TaCaO₃TiMoO₃ D08CFe₃ D011ClF₃FeS₄Sb₂ E33CuO₄SBaO₄S H02BH₄LiAlBa₅Ir₂O₁₁SrZn₅CaO₄Ta₂CuN₆AgC₈H₄N₅AlHO₂ E02CaMnSb₂BHO₂CCaO₃KNO₃N(NH₄)O₃ G010CaCO₃ G02CaMgO₄SiAgMnVO₄BiFeS₄SbBaCuO₅Sm₂BCoFeO₄BeHNaO₈Si₃ S47BrClI(NH₄) F514CuMnPAsCuSNiThAgTeAsCoGeS B16MnP B31BFe B27SSn B29AsFe B14NiSi BdNp AcNa