zinnwalditehttp://www.oed.com/dictionary/zinnwaldite_n%3Ftab%3Dmeaning_and_usezinnwaldite, n.
Revised 2021

zinnwalditenoun

Mineralogy.
  1. 1850–
    A kind of mica containing lithium and iron, mined as a source of lithium.
    Not now regarded as a distinct mineral species, but as forming a series intermediate in composition between siderophyllite and polylithionite.
    1. 1850
      The Zinnwald mica has been called Zinnwaldite.
      J. D. Dana, System of Mineralogy (ed. 3) 361
    2. 1915
      The potassium-lithium mica, zinnwaldite or cryophyllite, carries much more iron than magnesium.
      Proceedings of National Academy of Sciences U.S.A. vol. 1 576
    3. 2017
      Further pilot testing is planned on a range of materials including lepidolite, zinnwaldite and spodumene.
      ENP Newswire (Nexis) 1 March

zinnwaldite, n. was revised in March 2021.

zinnwaldite, n. was last modified in July 2023.