atomic number 64
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|Noun||1.||atomic number 64 - a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group|
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
samarskite - a complex black mineral occurring in pegmatites