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VERIFIED
Nov-06-15

Quartz

MOQ: Not Specified
From Cairo, Egypt
 
Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar.

Its crystal structure is a continuous framework of SiO4 siliconoxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.
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