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Symmetry dictionary (symCIF) version 1.0.1

_space_group.IT_coordinate_system_code

Name:
'_space_group.IT_coordinate_system_code'

Definition:

   A qualifier taken from the enumeration list identifying which
   setting in International Tables for Crystallography Volume A
   (2002) (IT) is used.  See IT Table 4.3.2.1, Section 2.2.16,
   Table 2.2.16.1, Section 2.2.16.1 and Fig. 2.2.6.4.  This item
   is not computer-interpretable and cannot be used to define the
   coordinate system.  Use _space_group.transform_* instead.

   Ref: International Tables for Crystallography (2002). Volume A,
        Space-group symmetry, edited by Th. Hahn, 5th ed.
        Dordrecht: Kluwer Academic Publishers.

Type: char

Mandatory item: no


The data value must be one of the following:


b1
monoclinic unique axis b, cell choice 1, abc

b2
monoclinic unique axis b, cell choice 2, abc

b3
monoclinic unique axis b, cell choice 3, abc

-b1
monoclinic unique axis b, cell choice 1, c-ba

-b2
monoclinic unique axis b, cell choice 2, c-ba

-b3
monoclinic unique axis b, cell choice 3, c-ba

c1
monoclinic unique axis c, cell choice 1, abc

c2
monoclinic unique axis c, cell choice 2, abc

c3
monoclinic unique axis c, cell choice 3, abc

-c1
monoclinic unique axis c, cell choice 1, ba-c

-c2
monoclinic unique axis c, cell choice 2, ba-c

-c3
monoclinic unique axis c, cell choice 3, ba-c

a1
monoclinic unique axis a, cell choice 1, abc

a2
monoclinic unique axis a, cell choice 2, abc

a3
monoclinic unique axis a, cell choice 3, abc

-a1
monoclinic unique axis a, cell choice 1, -acb

-a2
monoclinic unique axis a, cell choice 2, -acb

-a3
monoclinic unique axis a, cell choice 3, -acb

abc
orthorhombic

ba-c
orthorhombic

cab
orthorhombic

-cba
orthorhombic

bca
orthorhombic

a-cb
orthorhombic

1abc
orthorhombic origin choice 1

1ba-c
orthorhombic origin choice 1

1cab
orthorhombic origin choice 1

1-cba
orthorhombic origin choice 1

1bca
orthorhombic origin choice 1

1a-cb
orthorhombic origin choice 1

2abc
orthorhombic origin choice 2

2ba-c
orthorhombic origin choice 2

2cab
orthorhombic origin choice 2

2-cba
orthorhombic origin choice 2

2bca
orthorhombic origin choice 2

2a-cb
orthorhombic origin choice 2

1
tetragonal or cubic origin choice 1

2
tetragonal or cubic origin choice 2

h
trigonal using hexagonal axes

r
trigonal using rhombohedral axes

Category: space_group