Yftisite-(Y), Fergusonite-(Y)

Yftisite-(Y) : (Y,Dy,Er)₄(Ti,Sn)O(SiO₄)₂(F,OH)₆, Fergusonite-(Y) : YNbO₄

Locality: Ytterby, Resarö, Vaxholm, Uppland, Sweden

Yellowish translucent grains of yftisite-(Y) in fergusonite-(Y).
0.25 cm field of view. S409-028
Excalibur Mineral specimen.

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Yftisite-(Y), Fergusonite-(Y)

Yftisite-(Y) : (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6, Fergusonite-(Y) : YNbO4

Yftisite-(Y) : (Y,Dy,Er)₄(Ti,Sn)O(SiO₄)₂(F,OH)₆, Fergusonite-(Y) : YNbO₄