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What is it and where is it formed? Quartz is the most common mineral in the Earth’s crust. Quartz is in sandstones, granites, and other igneous rocks. It forms veins in the cracks of rocks. There is a lot of heat and water where they form.
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library.thinkquest.org/05aug/00461/quartz.htm
library.thinkquest.org/05aug/00461/quartz.htm
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Quartz - Wikipedia, the free encyclopedia
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Quartz is the second most abundant mineral in the Earth's continental crust (after feldspar). It is made up of a continuous framework of SiO 4 silicon-oxygen tetrahedra, with each oxygen being shar...
en.wikipedia.org/wiki/Quartz
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Information on the mineral quartz ... (Hexagonal) The crystal structure of Quartz is a complicated topic, and one must go into considerable detail to fully analyze this subject. (Brief explanation on the crystal structure of Quartz); Quartz forms unusual crystals.
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www.minerals.net/mineral/silicate/tecto/quartz/quartz.h...
www.minerals.net/mineral/silicate/tecto/quartz/quartz.htm
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Rock crystal quartz, the most common gem variety of quartz crystal, is, like all quartz, formed from the two most abundant elements in the earth's crust: silicon and oxygen. For centuries early civilizations believed that these pinhead size to nearly a meter in diameter rock crystals were permanently frozen ice.
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minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp1...
minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/quartz.html
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When crystallized in an open cavity in rocks, quartz forms easily-identifiable 6-sided (hexagonal) prismatic crystals. When formed without open spaces, deep within the earth, quartz crystallizes in small, roundish masses.
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www.mii.org/Minerals/photoqtz.html
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Sedimented hydrothermal precipitates of silica, now fine-grained quartz, are described from a Pb-Zn-bearing vein system. Their discrimination from the wall-accreted fine-grained quartz that is common in the shallow parts of epithermal systems is discussed.
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emg.geoscienceworld.org/cgi/content/abstract/16/1-2/37
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Links to other databases for Quartz :; 1 - Alkali-Nuts(English); 2 - Am. Min. Crystal Structure Database; 3 - Amethyst Galleries' Mineral Gallery; 4 - Athena; 5 - CalTech Mineral Spectroscopy; 6 - Earthprints Interactive Photo Gallary; ... Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
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www.webmineral.com/data/Quartz.shtml
www.webmineral.com/data/Quartz.shtml
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