quartz

ID: skos/Commodity/MIN4EU/quartz

Item class: Concept

Label (en): quartz

Label (hu):

Definition (en): 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. - http://en.wikipedia.org/wiki/Quartz

Definition (hu):

Concept scheme: Commodity

Broader concept: MIN4EU list of commodities