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Analcimes from some potassic igneous rocks and aspects of analcime-rich igneous assemblages

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Abstract

The mineralogy and chemistry of some analcime-rich igneous rocks — analcimites from the potassic Highwood province, Montana, and an analcime tinguaite from the Dunedin Volcanic Complex, New Zealand — have been investigated to obtain some indication of the K→Na substitution in natural analcimes. The analcimes have potash-poor compositions, the K2O revealed by the rock analyses being represented in the mode mainly by Or-rich feldspar (hyalophane or sanidine). These data and the evidence afforded by other analcime compositions confirm earlier conclusions based on experimental studies (Peters, Luth and Tuttle, 1966), namely that analcime solid solutions may contain up to approximately 2% K2O. Some aspects of analcime-rich igneous assemblages are also discussed.

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Wilkinson, J.F.G. Analcimes from some potassic igneous rocks and aspects of analcime-rich igneous assemblages. Contr. Mineral. and Petrol. 18, 252–269 (1968). https://doi.org/10.1007/BF00398895

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