Commission on Crystallographic Nomenclature

General information

The Commission on Crystallographic Nomenclature comprises an elected Chairperson and ex officio members, namely the editors of the Union's journals and International Tables, the Chairman of the IUCr/OUP Book series Committee, the Chairman of the Teaching Commission, the Chairman of the Committee for the Maintenance of the Crystallographic Information File Standard, the President and the General Secretary of the IUCr.

Nomenclature problems arising in specific fields of crystallography that come to the attention of, and are recognised as important by, the Commission are studied by ad hoc committees of experts appointed by the Commission. The reports of these working groups, after acceptance by the Commission and the Executive Committee, are published in Acta Crystallographica, Section A.

The results of past working groups, together with their recommendations, are contained in the reports listed below.

Crystallographers are invited to bring additional nomenclature problems to the attention of any Commission member.

Commission members


Crystallographic teaching aids

  • Teaching Pamphlets
  • Educational resources
  • Crystallographic symbols This will provide a link to sections 1.1 to 1.4 of Volume A of International Tables for Crystallography when software problems have been resolved
  • Basic crystallographic relations This will provide a link to Sections 1.1 and 1.2 of Volume C of International Tables for Crystallography when software problems have been resolved

Reference materials

Other nomenclature resources

  • bipm
Bureau International des Poids et Mesures (Home of the SI system of units)
  • iupac
International Union of Pure and Applied Chemistry Web Documents
  • iso
ISO Technical Committee 12: Quantities, units, symbols, conversion factors
  • iupap
IUPAP (International Union of Pure & Applied Physics) Commission on Symbols, Units, Nomenclature, Atomic Masses and Fundamental Constants (SUNAMCO)