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[en] Xenotime-(Y) with the highest content of Gd so far observed in this mineral was found in the metavolcanites of the Borka Nappe, Western Carpathians, Slovakia. It is in form of discrete crystals (up to 70 μm in size) Xenotime is usually enclosed in recrystalized volcanic glass which composed of microcrystalline quartz and white mica in association with zircon, monazite and apatite. Xenotime crystals show a concentric zoning in BSE. Central parts of the crystals are represented by xenotime I, which is enriched in Gd (up to 18 wt.% Gd2O3); (Gd3+ (0.21 apfu) and darker irregular rims are represented by xenotime II with the maximum content of Gd up to 3 wt.% Gd2O3; (Gd3+ (0.04 apfu).
Source
Galambos, M. (ed.) (Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University, Bratislava (Slovakia)); Dzugasova, V. (ed.) (Department of Genetics, Faculty of Natural Sciences, Comenius University, Bratislava (Slovakia)); Faculty of Natural Sciences, Comenius University, Bratislava (Slovakia); 1775 p; ISBN 978-80-223-3018-8; 
; 27 Apr 2011; p. 1707-1712; Student Scientific Conference PriF UK 2011; Studentska vedecka konferencia Prif Uk 2011; Bratislava (Slovakia); 27 Apr 2011; PROJECTS APVV-0438-06; APVV-0557-06; UK-243/2009; UK-527/2010; Also available from www.fns.uniba.sk/index.php?id=2503; 14 refs.
; 27 Apr 2011; p. 1707-1712; Student Scientific Conference PriF UK 2011; Studentska vedecka konferencia Prif Uk 2011; Bratislava (Slovakia); 27 Apr 2011; PROJECTS APVV-0438-06; APVV-0557-06; UK-243/2009; UK-527/2010; Also available from www.fns.uniba.sk/index.php?id=2503; 14 refs.