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Wikipedia Of Silica Quartz

Quartz is a tectosilicate mineral that is the second most common mineral in Earths continental crust Its crystal structure is a framework of SiO 4 siliconoxygen tetrahedraEach shares an oxygen atom with another tetrahedron so the overall chemical formula is SiO 2 or silica There are many different varieties of quartz some of which are semiprecious gemstones

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