Orthorhombic and monoclinic pyroxene have been successfully separated in hvo Norwegian hypersthene-gabbros and in a banded basic inclusion in one of them. When treated with methylene-iodide (sp.gr. 3.3), the clinopyroxene floated in con trast to the orthopyroxene which accumulated at the bottom. A purification of these concentrates was obtained with a Franz Isodynamic Separator due to the higher magnetic succeptibility of the orthopyroxene.