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Scapolite stoichiometry

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Abstract

Over the range Ca/(Ca + Na) from zero to 0.75, scapolites vary linearly between Na4Al3Si9O24Cl and NaCa3Al5Si7O24CO3, by means of a coupled replacement of Na3Si2Cl by Ca3Al2CO3. Ca includes minor Sr, Na includes K, and CO3 may include substantial SO4. From Ca/(Ca + Na) = 0.75 to 1.00, variation is between NaCa3Al5Si7O24CO3 and Ca4Al6Si6O24CO3, by means of a coupled replacement of NaSi by CaAl, as in plagioclase. Anion substitution is complete at the 0.75 point. Recalculation of scapolite analyses on the basis of Al + Si atoms = 12.0, as suggested by computed unit cell contents, offers a reasonable basis for normalization of atomic proportions. On this basis, Ca + Sr + Na + K + Fe atoms total very close to 4.0. New limits on the minor element content of scapolite are proposed. In view of the inflection at 0.75, subdivision of the scapolites at Ca/(Ca + Na) ratios of 0.25, 0.5, and 0.75 seems more logical than the 0.2, 0.5, and 0.8 limits used hitherto for marialite, dipyre, mizzonite, and meionite.

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Authors and Affiliations

  1. Department of Geology and Geophysics, University of California, 94720, Berkeley, California, USA

    Bernard W. Evans

  2. Department of Geology, McMaster University, Hamilton, Ontario, Canada

    Denis M. Shaw

  3. Department of Geology, Queen's University, Kingston, Ontario, Canada

    David R. Haughton

  4. Department of Geological Sciences, University of Washington, 98105, Seattle, Washington, USA

    Bernard W. Evans

Authors
  1. Bernard W. Evans
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  2. Denis M. Shaw
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  3. David R. Haughton
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Evans, B.W., Shaw, D.M. & Haughton, D.R. Scapolite stoichiometry. Contr. Mineral. and Petrol. 24, 293–305 (1969). https://doi.org/10.1007/BF00371272

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  • DOI: https://doi.org/10.1007/BF00371272

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