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Core CIF Dictionary version 2.3




Category: space_group

May appear in a looped list containing '_space_group_id'

Data type: char


;                                loop_
'C m c m'
'C 2/c 2/m 21/m'
'A m a m'
'three examples for the space group number 63'


_space_group_name_H-M_alt allows for any Hermann-Mauguin symbol to be given. The way in which this item is used is determined by the user and in general is not intended to be interpreted by computer. It may, for example, be used to give one of the extended Hermann-Mauguin symbols given in Table 4.3.1 of International Tables for Crystallography Vol. A (1995) or a Hermann-Mauguin symbol for a conventional or unconventional setting. Each component of the space group name is separated by a space or underscore. The use of space is strongly recommended. The underscore is only retained because it was used in earlier archived files. It should not be used in new CIFs. Subscripts should appear without special symbols. Bars should be given as negative signs before the numbers to which they apply. The commonly used Hermann-Mauguin symbol determines the space group type uniquely but a given space group type may be described by more than one Hermann-Mauguin symbol. The space group type is best described using _space_group_IT_number. The Hermann-Mauguin symbol may contain information on the choice of basis though not on the choice of origin. To define the setting uniquely use _space_group_name_Hall or list the symmetry operations.

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