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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 original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/commodity-code/industrial-mineral original
narrower quartz original
in scheme commodity-code original
is primary topic of quartz