atomic number 39
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|Noun||1.||atomic number 39 - a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys|
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.
fergusonite - a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals
gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
xenotime - a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form