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Euxenite
Euxenite or euxenite-(Y) (a correct mineralogical name) is a brownish black mineral with a metallic luster. ==Chemistry== 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 is commonly partially amorphous due to radiation damage. Euxenite forms a continuous series with the titanium rich polycrase-(Y) having the following formula: (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6
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