Optical symbols of minerals: pushkinite, kainite, barite-calcite, valuevite and kyanite

Abstract

Prof. Fedorov proposed a method for determining the nature of the dispersion of optical axes on a universal table and outputting the optical symbol of a mineral. Currently, at the Mineralogical Institute, a number of measurements have been taken using this method. This note presents the results of the first (still few) observations.