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Minerals that include Fe, Nb, O, U
'Ashanite'
(Nb,Ta,U,Fe,Mn)
4
O
8
'Hydroxyl-petscheckite'
UFe
1/3
(Nb,Ta)
2
O
7
(O,OH)
Ishikawaite
U
4+
Fe
2+
Nb
2
O
8
'Nohlite'
(Ca,Mg,Fe
2
,Y, etc·,U)
2
(Nb,Zr,Fe
3
)
3
O
10
'Oxy-petscheckite'
UFe
2/3
(Nb,Ta)
2
O
8
Petscheckite
UFe(Nb,Ta)
2
O
8
Samarskite-(Y)
(Y,Fe
3+
,Fe
2+
,U,Th,Ca)
2
(Nb,Ta)
2
O
8
Yttrocolumbite-(Y)
Y(U
4+
,Fe
2+
)Nb
2
O
8
Yttrotantalite-(Y)
(Y,Ca,U
4+
,Fe
2+
)
2
(Ta,Nb)
2
O
8
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