Index

Core dictionary (coreCIF) version 2.4.5

Category SPACE_GROUP

Name:
'_space_group_[]'

Definition:

   Contains all the data items that refer to the space group as a
   whole, such as its name or crystal system. They may be looped,
   for example, in a list of space groups and their properties.

   Only a subset of the SPACE_GROUP category items appear in the
   core dictionary.  The remainder are found in the symmetry CIF
   dictionary.

   Space-group types are identified by their number as given in
   International Tables for Crystallography Vol. A. Specific
   settings of the space groups can be identified either by their
   Hall symbol or by specifying their symmetry operations.

   The commonly used Hermann-Mauguin symbol determines the
   space-group type uniquely but several different Hermann-Mauguin
   symbols may refer to the same space-group type. A
   Hermann-Mauguin symbol contains information on the choice of
   the basis, but not on the choice of origin.  Different formats
   for the Hermann-Mauguin symbol are found in the symmetry CIF
   dictionary.

Example:

Example 1 - the monoclinic space group No. 15 with unique axis b.
 
    _space_group_id                 1
    _space_group_name_H-M_alt       'C 2/c'
    _space_group_IT_number          15
    _space_group_name_Hall          '-C 2yc'
    _space_group_crystal_system     monoclinic



Type: null

Category: category_overview