Abstract
An X-ray examination has been made of the products of the reaction of beryl with sodium fluoride, silicon tetrafluoride and sodium fluorosilicate. The evidence, in conjunction with that from chemical analysis, has enabled certain stages in the reaction of beryl with sodium fluorosilicate to be recognized. The first of these leads to a soluble fluoroberyllate, cryolite and cristobalite, and the second to the felspar albite. The third stage, occurring when all the beryl has been destroyed, produces albite, sodium fluoride and silicon tetrafluoride by a reaction between cryolite and cristobalite. The albite incorporates beryllium ions in its lattice and these cease to be extractable by water.
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