Description: Fergusonite-(Y), Feldspar Biotite Ytterby, Vaxholm, Sweden FoV: 4 x 4 cm One more ugly mineral that nevertheless is exciting. First the exotic formula, it is a niobate of yttrium (YNbO4) Then the locality is hardcore: It is a historical Swedish quarry that has delivered material for the discovery of 10 different rare earth elements - four of which have names derived directly from the place itself: Yttrium, Terbium, Erbium, Ytterbium about the site: http://www.mindat.org/loc-3191.html

All pictures, text, design © Forum FMF 2006-2025