Determination of the composition of kalsilites by an X-ray method

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Abstract
Summary: Three new analyses of kalsilite are given, with optical and X-ray data; two (K/(K + Na) = 0·95. 0·98) are from rocks where it is closely associated with nepheline. An analysis of one of the nephelines is also given (K/(K + Na) = 0·31). The cell dimensions vary appreciably with sodium content, and the composition of kalsilite may be determined from the equation:100 K/(K + Na) = 100−227·27(Δ 6·264),where Δ is the difference, in degrees, between the diffraction angles 2ϑ for 102 and 101, using Cu-Kα radiation.

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