Studies in the system KAlSiO4-BaAl2Si2O8-SiO2-H2O

✍ Scribed by A. P. Mall; V. Rudert

• Publisher: Springer
• Year: 1974
• Tongue: English
• Weight: 500 KB
• Volume: 48
• Category: Article
• ISSN: 0010-7999
• DOI: 10.1007/bf00399112

✦ Synopsis

Various members of the KA1Si3Os--BaA12Si~O s feldspar series are hydrothermally synthesized. Cellparameters of these are calculated from diffraetometer patterns and found to be similar to those of Gay and Roy. A variation diagram is constructed correlating Cncontent and values of AFeKa(20(nl)CaF2--20(00~)FSss), which gives Mol% Cn = 229.83320--190.81 by a least square regression fitting. Phase equilibria relation in the solidns-liquidus-region for the KA1SiaOs--BaA12Si~Os--tI20 system at 1000 kg/cm ~ are investigated. It is found to be a case of simple solid solution in a binary system, with reservations at the potassium-rich side of the system. Goranson (1938) gives a temperature of about 1000~ at 1000 kg/cm z PIt~O for the incongruent melting of sanidine, but the authors prefer a value around 930~ at the same Ptt~O. Reaction products of starting materials on the join KA1Si~Oe--BaA12Si~O s and KA1Si04--BaAl2Si20s gave no experimental hint for replacement of K + by Ba ++.