foyalite

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English

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Noun

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foyalite (countable and uncountable, plural foyalites)

  1. (mineralogy) A fine-grained Plutonic syenite made up of orthoclase, nepheline, hornblende, and accessory mica, sodalite, zircon, noselite, and pyroxene.
    • 1864, The American Journal of Science and Arts, page 70:
      […] while foyalite is an almost pure iron-chrysolite.
    • 1948, Frank K. McIntosh, McHenry Mosier, Investigation of Wood Chromite Mine Area Lancaster County, PA, page 7:
      The free energy remains negative throughout the whole temperature range, indicating that the association forstorite + ilmenite is thermodynamically more stable than foyalite + geikielite.
    • 2009, K. L. Shrivastava, Economic Mineralization, page 197:
      Thin section photograph of foyalite (peralkaline phonolite) from Sevrano ki Dhani.
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