Er – Erbium

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Euxenite-Y
Fergusonite-Y
Xenotime

According to Mindat there are 7 known minerals containing Erbium:

(Y, Er, Ca, Zr, Ta, Si, O)

(Mn,Ca)4Al(Al,Yt,Er)(Si,Ti)3O13

(Ca,Yb,Er)4Y4(Si8O20)(CO3)6(OH) · 7H2O

(Y,Er)(Nb,Ti,Ta)(O,OH)4

(Y,Er,U,Th,Fe3+)3(Ti,Nb,Ta)10O26

Ca(Y,Ce,Nd,Tb,Er)Be2Si2(O,OH)10

(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6

From Wikipedia:

According to wikipedia –