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nouna trivalent metallic element of the rare earth group; occurs with yttrium
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Definition that contains erbium
- gadolinite a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
- ytterbite a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
- terbium metal a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
- fergusonite a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals