Euxenite
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Euxenite or euxenite-Y is a brownish black mineral with a metallic luster, found in Norway. It contains calcium, niobium, tantalum, cerium, titanium, yttrium, and typically uranium and thorium, with some other metals. The chemical formula is: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6. It occurs in pegmatites and black sands. Commonly partially amorphous due to radiation damage.
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