Commodity Code

hafnium

http://resource.geosciml.org/classifier/cgi/commodity-code/hafnium

definition Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. more like this
notation
02.01.12 more like this
Hf more like this
source http://en.wikipedia.org/wiki/Hafnium more like this
type
Resource
Concept
broader metal
narrower hafnium
in scheme commodity code
is primary topic of hafnium