gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1969.037.288.05 Studies in the System BaO-Al2O3-SiO2 III. The Binary System Sanbornite-celsian Lin H. C. 1 Foster W. R. Department of Mineralogy, The Ohio State University, Columbus, Ohio 43210, U.S.A.

Present address: Department of Geology Sciences, Queen's University, Kingston, Ontario, Canada.

 12 1969 37 288 459 465 24 2 1969 Copyright © 1969, The Mineralogical Society 1969 Summary

The system sanbornite-celsian has been investigated by the quenching method, and the results compared with earlier studies. The system is essentially a simple binary eutectic system with little or no solid solution. The eutectic is located at a composition of 69% sanbornite and 31% celsian (by weight) and at a temperature of 1227±3°C. No evidence for substantial solid solution of celsian in sanbornite, as reported in previous work, was found. Paracelsian, a naturally occurring polymorph of celsian, was not encountered in the study.