atomic number 58
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|Noun||1.||atomic number 58 - a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant 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
monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium