APPLICATION OF EFFECTIVE SUBSTITUTES FOR FELDSPARATE MATERIALS IN THE CERAMIC INDUSTRY Journal title: International scientific journal Science and Innovation Authors: Z.A. Ikramova, N.T.Alimxodjayeva, G.G.Sulaymanova, A.U. Tukhtamusheva Subject(s): Archaeology, Arts and Literature, Biological Sciences, Chemistry, Computer and Information Science, Economics, Education, Humanities, Law, Linguistics, Mathematics, Medicine, Philosophy, Physics, Psychology, Social Sciences, Architecture, Agricultural Science