Crystal Lab › The 230 space groups › Orthorhombic
No. 63 C m c m
Orthorhombic space group · 16 symmetry operations per cell · 8 Wyckoff positions · 6 settings
Symmetry elements and Wyckoff positions (interactive)
No. 63 C m c m
SettingLoading the group…
x = 0.10, y = 0.17, z = 0.08
- Number
- 63
- Hermann–Mauguin symbol
- C m c m
- Hall symbol
-C 2c 2- Crystal system
- Orthorhombic
- Operations per cell
- 16
- General position
- 16h (site symmetry 1)
Wyckoff positions (standard setting)
| Multiplicity | Letter | Site symmetry |
|---|---|---|
| 16 | h | 1 |
| 8 | g | ..m |
| 8 | f | m.. |
| 8 | e | 2.. |
| 8 | d | -1 |
| 4 | c | m2m |
| 4 | b | 2/m.. |
| 4 | a | 2/m.. |
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.
Prototype structures in this group (60)
Nb₁₂O₂₉Br₂Cu₂O₆PbSe₂Na₂O₄SCl₂O₅Pb₃WFe₂O₅Ti E41Nd₂Te₅Ca₂LaMn₂O₇Fe₂KS₃Al₂CuMg E1aSi₂Zr C49Re₂UCu₃Ge₄K₂O₁₂As₃Nb₄F₃Na₃O₈P₂V₂Co₃Ga₉Y₂La_3NbO₇Ga₃PdSrLa₄₃Mg₅Ni₁₇Bi₄O₁₁V₂Al₄FeO₁₀(OH)₂Si S04Al₄NiYSn₄SrPd₅Pu₃Al₅Fe₂Te₅ZrAl₆Mn D2hO₇SnSr₃Ag₇Ca₂Ni₇S₆FeHO₂ E04CrNa₂O₄ H18CFe₂SiThCuO₂SrAlO₄PCaFe₃O₅MgO₃SiAsMn₃NdTe₃BRe₃AlF₃CaFe₄O₆BaF₄MgCaO₄Si H01AlF₅Tl₂NiS₅Ta₂CaFe₅O₇BaZn₅CuKS₃ZrAsCV₃NaNbO₃FeLiO₄PMgO₄SNbNiTe₅BCUAlBMoHgNaBCr B33SSnSi₂₄U A20