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Feldspars and Feldspathoids pp 471–499Cite as

Feldspathoid Stabilities and Phase Inversions — A Review

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Part of the book series: NATO ASI Series ((ASIC,volume 137))

Abstract

The SiO2-undersaturated part of the system NaAlSiO4-KAlSiO4-SiO2± H2O is used to discuss the liquidus stability relations of nepheline, kalsilite and leucite at 1 atm and elevated \( P_{H_2 O} \) · Analcime coexists with silicate liquid (primary analcime) at \( P_{H_2 O} \) > 5 kbars for Na2O-rich undersaturated compositions in the residua system. The coprecipitation or resorption nature of leucite on the leucite-feldspar field boundary is discussed as a function of bulk composition, \( P_{H_2 O} \) and for both equilibrium and fractional crystallization. The presence of certain other components markedly changes the stability conditions for nepheline in the residua system. Thus at 1 kbar the presence of an aqueous fluid containing as little as 0.01 mole fraction of chloride may stabilise primary sodalite . It seems likely that cancrinite should be stabilized as a primary liquidus phase at high enough CO2 fugacities in the presence of CaO.

The ‘flexibility’ of feldspathoid framework structures is reflected in the variety of chemical compounds (both natural minerals and synthetic phases) which have related structures and in the polymorphism shown by some of these. Displacive inversions exhibited by pure-Na nepheline (NaAlSiO4 ) and SiO2-rich natural and synthetic leucites are martensitic in character. Such inversions may be more common in framework silicates than hitherto imagined.

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Authors and Affiliations

  1. Department of Geology, The University, Manchester, M13 9PL, UK

    C. M. B. Henderson

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Editors and Affiliations

  1. Laboratory of Petrology, University of Nancy I, Nancy, France

    William L. Brown

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Henderson, C.M.B. (1984). Feldspathoid Stabilities and Phase Inversions — A Review. In: Brown, W.L. (eds) Feldspars and Feldspathoids. NATO ASI Series, vol 137. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-6929-3_13

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  • DOI: https://doi.org/10.1007/978-94-015-6929-3_13

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-015-6931-6

  • Online ISBN: 978-94-015-6929-3

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