Hingganite-(Y)
Furka basis tunnel, Oberwald, Obergoms, Goms, Valais, Switzerland
EDX: 4.7% Al, 55.3% Si, 1.1% Cl, 3.4% K, 6.1% Ca, 2.4% Fe, 21.7% Y, 0.6% Ce, 1.3% Nd, 1.3% Sm, 1.2% Gd, 1% Dy
So its not Gadolinite-Y but Hingganite-Y.
From the "Bedretto-window" of the Furkabasistunnel. Ex-Collection Alex Kipfer. Picture width 3 mm. Collection and photo Stephan Wolfsried
© Stephan Wolfsried 6/2017