RT Journal Article SR Electronic T1 Further data on the system Na 2 O-CaO-SiO 2 JF American Journal of Science JO Am J Sci FD American Journal of Science SP 586 OP 601 DO 10.2475/ajs.251.8.586 VO 251 IS 8 A1 Segnit, Egdar R. YR 1953 UL http://www.ajsonline.org/content/251/8/586.abstract AB