During the summer of 1947 while visiting the quarries of the American Nepheline Corporation at Blue Mountain in Methuen township, Ontario, Phoenix collected several specimens of fine, amber-yellow cancrinite. He subsequently analyzed selected material from the specimens on his return to Toronto. A portion was handed to Nuffield for further study. Professor M. A. Peacock and Mr. E. G. Robinson kindly undertook to measure the indices of refraction in Na light. Although chemical analyses of cancrinite with optical data are fairly plentiful in the literature, only one analysis is accompanied by cell dimensions. Therefore it was felt worthwhile to record the data collected during the study. This paper also discusses the chemical constitution of cancrinite and certain relationships between composition and optical properties.

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