Literature cited
A. K. Kuzovlev and V. B. Il'ganaev, Steklo Keram., No. 4, 12 (1975).
V. I. Revnivtsev, Beneficiation of Feldspars and Quartz [in Russian], Neda, Moscow (1970).
A Study of the Capacity of Sand for Beneficiation for Glass-Melting (a report) [in Russian], Promstroiizdat, Moscow (1952).
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Translated from Steklo i Keramika, No. 8, pp. 13–14, August, 1981.