Commodity Code

niobium

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

definition Niobium, formerly columbium, is a chemical element with the symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite. more like this
notation
02.01.18 more like this
Nb more like this
source http://en.wikipedia.org/wiki/Niobium more like this
type
Resource
Concept
broader metal
narrower niobium
in scheme commodity code
is primary topic of niobium