zircon-syenitehttp://www.oed.com/dictionary/zircon-syenite_n%3Ftab%3Dmeaning_and_usezircon-syenite, n.
Revised 2021

zircon-syenitenoun

Geology.
  1. 1813–
    A plutonic rock resembling syenite and containing a relatively large amount of zircon.
    In early use perhaps referring to nepheline-syenite n.
    1. 1813
      I went a few steps farther, and zircon syenite [German Zircon-syenit] lay immediately above the porphyry.
      J. Black, translation of L. von Buch, Trav. Norway & Lapland iii. 64
    2. 1879
      Elæolite is a constituent of the rocks zircon-syenite, foyaite, miascite, and ditroite.
      F. Rutley, Study of Rocks x. 108
    3. 1940
      Zircon is widespread and at a few places affords megascopic crystals, so that the rocks were named zircon-syenite before the nepheline was recognized.
      F. F. Grout, Kemp's Handbook Rocks (ed. 6) iii. 70
    4. 2001
      A xenolith of zircon syenite from basalt near Daylesford.
      Journal & Proceedings of Royal Society New South Wales vol. 134 109/2

Originally published as part of the entry for zircon, n.

zircon, n. was revised in March 2021.