Commodity Code

quartz

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

definition Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. It is made up of a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. There are many different varieties of quartz, several of which are semi-precious gemstones. more like this
notation
01.02.32 more like this
Qtz more like this
source http://en.wikipedia.org/wiki/Quartz more like this
type
Resource
Concept
broader industrial mineral
narrower quartz
in scheme commodity code
is primary topic of quartz