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Rare-earth

Any of the fifteen lanthanides plus scandium and yttriumRare-earth elementsin the periodic tableRare-earth ore(shown with a 19 mm diameter US 1 cent coin for size comparison)Refined rare-earth oxides are heavy, gritty powders usually brown or black, but can be lighter colors as shown here.Back row: gadolinium · praseodymium · ceriumMiddle row: samarium · lanthanum Front: neodymiumThe rare-earth elements (REE), also called rare-earth metals, or rare earths, are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals.

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