title: Methods of space-group determination - a supplement dealing with twinned crystals and metric specialization.
abstract: Tables for the determination of space group for single crystals, twinned crystals and crystals with a specialized metric are presented in the form of a spreadsheet for use on a computer. There are 14 tables, one for each of the Bravais-lattice types. The content of the tables is arranged so that at the intersection of rows, displaying the conditions for reflection, and of columns, displaying the Laue and crystal classes, one finds those space groups compatible with the observed Bravais-lattice type, the conditions for reflection and the Laue and crystal classes. The tables are intended to be of direct use to an experimentalist working with an unknown structure.
authors.affiliation: Chimie minérale analytique et appliquée, University of Geneva, Geneva, Switzerland.
authors.forename: Howard D
authors.initials: HD
authors.lastname: Flack
keywords: metric specialization; space group; space-group determination; twin