Commodity Code

rare earth element

http://resource.geosciml.org/classifier/cgi/commodity-code/rare-earth-element

alt label
TREE more like this
definition As defined by IUPAC, a rare earth element (REE) or rare earth metal is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium. Scandium and yttrium are considered rare earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties. more like this
narrower hree
broader rare earth element
lree
broader rare earth element
notation
02.01.03 more like this
REE more like this
source http://en.wikipedia.org/wiki/Rare_earth_element more like this
type
Resource
Concept
broader metal
narrower rare earth element
in scheme commodity code
is primary topic of rare earth element