(Y, Er, U, Ca, Th)2(Nb, Ta, Fe, Ti)7O18?
Validity questionable; may be an inhomogenous alteration product of euxenite.
U = 17.1 percent, Th = 1.8 percent.
Color: Brown to black. From granite pegmatite.
Source: Frondel, Judith Weiss and Michael Fleischer. 1955. Glossary of Uranium- and Thorium-Bearing Minerals, Third Edition. Washington DC: United States Government Printing Office
A former name for samarskite.
Source: Dictionary of Mining, Mineral, and Related Terms