Betafite

An isometric mineral, (Ca,Na,U)₂ (Ti,Nb,Ta)₂ O₆ (OH); pyrochlore group; forms a series with pyrochlore; name assigned to members of the series having uranium greater than 15%; radioactive; in granitic pegmatites. CF: uranpyrochlore

Source: Frondel, Judith Weiss and Michael Fleischer. 1955. Glossary of Uranium- and Thorium-Bearing Minerals, Third Edition. Washington DC: United States Government Printing Office