Hydrothermal chemistry of silicates. Part XIX. A partial study of the system CaO–B2O3–GeO2–H2O

Abstract

The hydrothermal reactions of the system CaO–B₂O₃–GeO₂–H₂O at 415 °C show considerable resemblances to reactions in the analogous system with GeO₂ replaced by SiO₂. In each case many crystalline phases were formed, prominent among which were borates. Five of the borates were common to each system. The germanium-containing system also yielded germanates and borogermanates, including the germanium analogue of datolite. The compounds formed have been characterised by their X-ray powder patterns and where possible in other ways.