The feldspars Phase relations, optical properties, and geological distribution. Transl. from Russian. Transl. ed. by M. J. Oppenheim and I. Perath - Marfunin, Arnolʹd Sergeevič 1926- (Institut geologii rudnych mestoroždenii, petografii, mineralogii i geochimii <Moskau, Akad. d. Wiss.>: Trudy., 1969)