Commodity Code

thallium

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

definition Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray other metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air. more like this
notation
02.01.25 more like this
Tl more like this
source http://en.wikipedia.org/wiki/Thallium more like this
type
Resource
Concept
broader metal
narrower thallium
in scheme commodity code
is primary topic of thallium