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Hoelzel Classification

4 OXIDES

4.D Dioxides

4.DJ Titanates, Niobates and Tantalates, C large, V medium ò 2

4.DJ.1 Euxenite-Group

Euxenite-(Y) Y(Nb0.5Ti0.5)2O6 orthorhombisch Pbcn mmm 4.DJ.100
Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 orthorhombisch Pbcn mmm 4.DJ.110
Uranopolycrase (U,Y)(Ti,Nb,Ta)2(O,OH)6 orthorhombisch Pbcn mmm 4.DJ.120
Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 orthorhombisch Pbcn mmm 4.DJ.130
Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 orthorhombisch Pbcn mmm 4.DJ.150

4.DJ.2 other Titanates

Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6 kubisch 4.DJ.240
Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe3+)2(O,OH)6 4.DJ.260
Lucasite-(Ce) (Ce,La)Ti2(O,OH)6 monoklin I2/a 2/m 4.DJ.280

4.DJ.3 Aeschynite-Group

Aeschynite-(Ce) (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 orthorhombisch Pbnm mmm 4.DJ.300
Aeschynite-(Y) (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6 orthorhombisch Pbnm mmm 4.DJ.310
Aeschynite-(Nd) (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6 4.DJ.320
Tantalaeschynite-(Y) (Ca,Y,Ce)(Ta,Ti,Nb)2O6 orthorhombisch Pbnm mmm 4.DJ.330
Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 orthorhombisch Pbnm mmm 4.DJ.340
Nioboaeschynite-(Y) [(Y,Ln),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 orthorhombisch Pbnm mmm 4.DJ.350
Rynersonite Ca(Ta,Nb)2O6 orthorhombisch Pbnm mmm 4.DJ.370
Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 orthorhombisch Pbnm mmm 4.DJ.380

4.DJ.4 Fergusonite-Group

Yttrotantalite-(Y) (Y,U,Fe2+)(Ta,Nb)(O,OH)4 orthorhombisch 4.DJ.400
Fergusonite-(Y)-β YNbO4 monoklin I2/a 4.DJ.410
Fergusonite-beta-(Nd) (Nd,Ce)NbO4 4.DJ.420
Fergusonite-(Ce)-β (Ce,La,Nd)NbO4 monoklin I2/a 2/m 4.DJ.430
Takanawaite-(Y) Y[Ta,Nb]O4 monoklin I2/a 2/m 4.DJ.440
Fergusonite-(Y) YNbO4 tetragonal I41/a 4/m 4.DJ.450
Formanite-(Y) YTaO4 monoklin P2/a 2/m 4.DJ.460
Iwashiroite-(Y) YTaO4 monoklin P2/a 2/m 4.DJ.465
Fergusonite-(Ce) CeNbO4 tetragonal I41/a 4/m 4.DJ.470

4.DJ.5 Other Niobates, Tantalates

Irtyshite Na2(Ta,Nb)4O11 hexagonal P63/m, P63 6/m, 6 4.DJ.500
Cesplumtantite (Cs,Na)2(Pb,Sb3+)3Ta8O24 tetragonal 4.DJ.510
Ungursaite Ca(Ta,Nb)4O11 hexagonal P63, P63/m 6, 6/m 4.DJ.530
Calciotantite CaTa4O11 hexagonal P6322 622 4.DJ.540
Petscheckite U4+Fe2+Nb2O8 trigonal P31m 3m 4.DJ.560
Liandratite U6+(Nb,Ta)2O8 trigonal P31m 3m 4.DJ.570
Murataite-(Y) (Y,Na)6(Zn,Fe3+)5(Ti,Nb)12(O,F,OH)43 kubisch F43m 43m 4.DJ.580
Changbaiite PbNb2O6 trigonal R3m 3m 4.DJ.590

4.DJ.6 Brannerite-Group

Brannerite (U,Ca,Y,Ce)(Ti,Fe)2O6 monoklin C2/m 2/m 4.DJ.600
Orthobrannerite U4+U6+Ti4O12(OH)2 orthorhombisch P2122 222 4.DJ.620
Thorutite (Th,U,Ca)Ti2(O,OH)6 monoklin C2/m 2/m 4.DJ.640



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