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Gadolinite is a mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of cerium, lanthanum, neodymium, yttrium, beryllium, and iron with formula: (Ce,La,Nd,Y)<sub>2</sub>FeBe<sub>2</sub>Si<sub>2</sub>O<sub>10</sub>. Called gadolinite-(Ce) or gadolinite-(Y) depending on the prominence of the variable element composition(namely, Y if it has more yttrium, and Ce if it has more cerium).