Chromian muscovite occurs in veins or pockets in meta-anorthosite at widely scattered localitics in the Caledonides of Norway and contains 0,15-0,45% Cr, 0, 001-0,008% V, and 1-5% Fe. Chlorite, epidote, biotite, hornblende, and kyanite are the most common associated minerals while a highly ordered sodic plagioclase, zoisite, muscovite, and paragonite are the most common mincrals of the host rocks. The vein minerals belong to a late hydrothermal stage of the alteration of the anorthosites.