Kilchoanite, a polymorph of rankinite

Abstract

THE compound 9CaO6SiO2H2O was originally synthesized and described by Roy1,2, who called it phase Z. Revised data on its properties have been given by Roy, Gard, Nicol and Taylor3, who showed that, when hydrothermally synthesized at 715°C. and with a pressure of 1,100 bars, its composition was 3CaO2SiO2 and that it became inverted to rankinite on heating between 954°C. and 1,090°C. © 1961 Nature Publishing Group.