00567naa#a2200193#i#450# EN\\bibl\80735 20241127061827.3 2076-0655 20160925b2016####ek#y0engy0150####ca RUS RU Influence of impurities in the quartz-feldspar sand glass quality Journal article Moscow Individual Entrepreneur Svetlana Vasilievna Samchenko 2016 3 с. Journal article local Min’ko N I Yakh’ya M Dobrinskaya O A tsilicates.ru