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Several kinds of norms exist in petrology and geochemistry, those favored by the American and British geologists originate f rom Cross, Iddings, Pirsson and Washington (1903). The CIPW norms have subsequently been modified in a var iety of ways so that hardly any of the proposed methods of calculating them are exactly alike. Computer programs have also been developed for the var i ous ways of calculating the CIPW norms (e.g. Jung and Schulz 1965). In Scandinavia the norm system originating f rom Niggli (1936) and later modified at several points by Bar th is used in its latest form as outlined by Bar th in 1962. Wedepohl (1969) calls these norms the Niggli-Barth norms, the name which is also adopted here. No published computer program exists to date for these norms, to the best of the author 's knowledge. Since the space does not permit reproduction of the entire program, nor of its f low char t or accompanying program description, only the main characteristics can be given in this context. Those interested in obtaining the program list, f low char t and step-by-step description can do so f rom the wr i te r at a charge thought reasonable to cover duplication costs.

A FORTRAN IV program for the calculation of the petrological Niggli-Barth norms – A brief communication