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Descriptor English:   Metals, Rare Earth 
Descriptor Spanish:   Metales de Tierras Raras 
Descriptor Portuguese:   Metais Terras Raras 
Synonyms English:   Earth Metals, Rare
Rare Earth Metals  
Tree Number:   D01.268.558
Definition English:   A group of elements that include SCANDIUM; YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically, the rare earth metals got their name from the fact that they were never found in their pure elemental form, but as an oxide. In addition they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust. 
Indexing Annotation English:   GEN: prefer specifics
History Note English:   76; was NON MESH before 1976 
Allowable Qualifiers English:  
AD administration & dosage AE adverse effects
AG agonists AN analysis
AI antagonists & inhibitors BL blood
CF cerebrospinal fluid CS chemical synthesis
CH chemistry CL classification
EC economics HI history
IM immunology IP isolation & purification
ME metabolism PK pharmacokinetics
PD pharmacology PO poisoning
RE radiation effects ST standards
SD supply & distribution TU therapeutic use
TO toxicity UR urine
Record Number:   8850 
Unique Identifier:   D008674 

Occurrence in VHL: