The International Union of Pure and Applied Chemistry (IUPAC) definition of the REE group includes lanthanides (Ln), yttrium (Y) and scandium (Sc). 2024, Martin Ondrejka, Peter Bačík, Juraj Majzlan, Pavel Uher, Štefan Ferenc, Tomáš Mikuš, Martin Števko, Mária Čaplovičová, Stanislava Milovská, Alexandra Molnárová, Christiane Rößler, Christian Matthes, “Xenotime-(Gd), a new Gd-dominant mineral of the xenotime group from the Zimná Voda REE–U–Au quartz vein, Prakovce, Western Carpathians, Slovakia”, in Mineralogical Magazine, volume 88, number 5:
REE-bearing minerals in these occurrences are allanite, betafite, brannerite, davidite, euxenite, fergusonite, florencite, monazite, polycrase, samarskite, synchysite, thorite, xenotime and yttrocrasite. 2014, Broder J. Merkel, Alireza Arab, Uranium - Past and Future Challenges: Proceedings of the 7th International Conference on Uranium Mining and Hydrogeology, page 27: