Data Item _space_group.crystal_system
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General 
- Item name
- _space_group.crystal_system
- Category name
- space_group
- Attribute name
- crystal_system
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 7.0 % of entries
Item Description
The name of the system of geometric crystal classes of space
groups (crystal system) to which the space group belongs.
Note that rhombohedral space groups belong to the
trigonal system.
Data Type 
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| cubic | |
| hexagonal | |
| monoclinic | |
| orthorhombic | |
| tetragonal | |
| triclinic | |
| trigonal |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| cubic | |
| hexagonal | |
| monoclinic | |
| orthorhombic | |
| tetragonal | |
| triclinic | |
| trigonal |
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _symmetry.cell_setting | alternate |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _space_group_crystal_system | cif_core.dic | 2.3 |