Abstract
Abstract This program provides a way to calculate a norm composed of any group of minerals selected by the user. The norm minerals may comprise the CIPW set, but also may include any other minerals defined by formula or chemical analysis. The standard CIPW norm calculation minimizes the sum of norm minerals when calculated as molecular amounts not normalized to 100%. This minimization principle can be generalized to a norm composed of arbitrary conventional or analyzed minerals, defaulting to CIPW for appropriate selection of minerals, permitting calculation of norms comparable to modes for igneous and metamorphic rocks. Such a norm gives a quantitative representation of the mineralogy of rocks for which incomplete mineral chemistry data are available, and offers a quick and easy check of the compatibility of modal and bulk chemical data, and of bulk chemical and mineral chemical data.
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