ytteriten.

/ˈɪtərʌɪt/Etymology: < Ytter(by (see ytterbite n.) + -ite suffix1.
Mineralogy.
the world > the earth > minerals > types of mineral > silicates > miscellaneous silicates > [noun] > silicate of ythrium
1849 H. Watts tr. L. Gmelin III. 409 Silicate of Yttria.—Gadolinite, or Ytterite.
This entry has not yet been fully updated (first published 1921; most recently modified version published online June 2018).