Feldspar Group: Mineral information, data and localities.
Alkali feldspar feldspar minerals rich in sodium or potassium. Plagioclase the albite to anorthite series. Pronounciation of Feldspar GroupHide ... Bezing, L. von, Bode, R. Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern: 270 (in English)