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Analcime phenocrysts in a vitrophyric analcimite — Primary or secondary?

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Abstract

A vitrophyric analcimite contains phenocrysts of analcime and olivine in a groundmass of titansahlite, titanomagnetite, apatite, and abundant glass. The chemistry of the analcimite and its vitric residuum, the crystallization history of the host, and experimental data collectively favour an interpretation that the analcime “phenocrysts” are ion-exchanged KAl-Si2O6 leucites. Conversion of leucite to analcime resulted from two-way diffusion involving Na+ and H2O, and K+ across the original leucite-glass interfaces and probably was largely accomplished during hydration of the vitric groundmass.

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  1. Department of Geology, University of New England, 2351, Armidale, New South Wales, Australia

    J. F. G. Wilkinson

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  1. J. F. G. Wilkinson
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Wilkinson, J.F.G. Analcime phenocrysts in a vitrophyric analcimite — Primary or secondary?. Contr. Mineral. and Petrol. 64, 1–9 (1977). https://doi.org/10.1007/BF00375282

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  • DOI: https://doi.org/10.1007/BF00375282

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