zeagonitehttp://www.oed.com/dictionary/zeagonite_n%3Ftab%3Dmeaning_and_usezeagonite, n.
Revised 2018

zeagonitenoun

Mineralogy. Now historical and rare.
  1. 1823–
    A supposed zeolite mineral, later identified as a mixture of phillipsite with gismondine or levyne.
    1. 1823
      Zeagonite..being the name under which the mineral, also called Abrazite and Gismondin, had been previously known.
      H. J. Brooke, Familiar Introduction to Crystallography 442
    2. 1846
      There is..in one spot a curious slaty rock, divided into quadrangular columns, having a base almost like trachyte, with drusy cavities lined by crystals, too imperfect, according to Professor Miller, to be measured, but resembling Zeagonite.
      C. Darwin, Geological Observations on South America vi. 153
    3. 1915
      The ‘zeagonite’ from Mt. Vesuvius contains 51.87% H2O, or only slightly less than phillipsite.
      Chemical Abstracts vol. 9 578
    4. 2004
      Zeagonite..was not accepted as a new mineral, because it was a mixture.
      W. A. Deer et al., Introd. Rock-forming Minerals (ed. 2) vol. IV. b 676

zeagonite, n. was revised in June 2018.

zeagonite, n. was last modified in July 2023.