yttrocrasiteとは 意味・読み方・使い方

名詞

yttrocrasite (countable かつ uncountable, 複数形 yttrocrasites)

1. (mineralogy) An oxide of (primarily) titanium and yttrium, with small to moderate amounts of thorium, uranium, cerium, and calcium substituting for some of the yttrium and traces of iron, tungsten, columbium, and tantalum substituting for some of the titanium.
   • 1977, The Mineralogical Record (volume 8, page 90)

     Yttrocrasite, associated with allanite, gadolinite, and fergusonite, occurs as a minor rare earth constituent of the inner intermediate zone.

   • 2014, Broder J. Merkel, Alireza Arab, Uranium - Past and Future Challenges: Proceedings of the 7th International Conference on Uranium Mining and Hydrogeology (page 27)

     REE-bearing minerals in these occurrences are allanite, betafite, brannerite, davidite, euxenite, fergusonite, florencite, monazite, polycrase, samarskite, synchysite, thorite, xenotime and yttrocrasite.