Literature cited
V. I. Dobuzhinskii, Steklo i Keramika, No. 1 (1976).
Yu. S. Slepnev et al., Volcanic Rock as Raw Material for Ceramic Industry (Survey) [in Russian], VNIIÉSM (1975).
V. F. Pavlov, Works of the Scientific-Research Institute of Structural Ceramics, Issue 37 (1973).
I. S. Usenko et al., Handbook on the Petrography of the Ukraine [in Russian], Naukova Dumka, Kiev (1975).
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Translated from Steklo i Keramika, No. 8, pp. 23–24, August, 1976.