Nomenclature for crystal families, Bravais-lattice types and arithmetic classes. Report of the International Union of Crystallography<i>Ad-Hoc</i>Committee on the Nomenclature of Symmetry

Abstract

Standard symbols representing crystal families, two- and three-dimensional Bravais-lattice types and arithmetic classes are recommended for use by the IUCr. The six crystal families are designated by lower-case letters. The family letter in the symbol of each of the 14 lattice types is followed by an upper-case letter to distinguish different lattice types within the family. Arithmetic classes are indicated by modified symbols of the corresponding symmorphic space groups.