The mckelveyite group includes: donnayite-(Y): NaSr3CaY(CO3)6.3H2O ewaldite: Ba(Na,Ca,Y,Ce,K)(CO3)2.2.6H2O mckelveyite-(Y): NaBa3(Ca,U)Y(CO3)6.3H2O weloganite: Na2Sr3Zr(CO3)6.3H2O Back to Minerals