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It is found in nearly every geological environment and is at least a component of almost every rock type. It frequently is the primary mineral, >98%. It is also the most varied in terms of varieties, colors and forms. ... Rock crystal is the clear variety that is also used as a gemstone.
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www.galleries.com/minerals/silicate/quartz/quartz.htm
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Rock crystal is the name given to all clear colorless quartz. It is widely used as a popular ornamental stone and is also used as a gemstone. Although it is one ... The most common use for rock crystal is in ornamental carvings. A well known ornamental carving for rock crystal is the crystal ball of fortune telling fame.
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www.galleries.com/minerals/gemstone/rock_cry/rock_cry.h...
www.galleries.com/minerals/gemstone/rock_cry/rock_cry.htm
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The Mutitjulu Arkose is believed to be of about the same age as the conglomerate at Kata Tjuta, and to have a similar origin despite the rock type being different, but it is younger than the rocks exposed to the east at Mount Conner, and unrelated to them.
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www.crystalinks.com/ayersrock.html
www.crystalinks.com/ayersrock.html
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It certainly looks like a piece of reef quartz, and some of the rock surrounding the reef appears to be attached. The discoloration is due to iron oxides and hydroxides. Other than that; it looks like pretty pure quartz.
http://answers.yahoo.com/question/index?qid=20090518001...
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The atoms of a mineral form geometric shapes, or crystals. Minerals are defined by two things: their chemical composition and the manner in which they crystallize. So crystals are composed of...
http://www.ehow.com/information_1010-p67-k12.html
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Rock crystal quartz mineral information page at mineralminers.com: your on-line link for factual scientific data & mineralogical information about natural rock crystal quartz, with links to many different types of natural rock crystal quartz items including mineral specimens and crystals, jewelry, and lapidary rough, as ...
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www.mineralminers.com/html/rkxminfo.htm
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Quartz Crystals and Quartz Clusters; (and other natural rock crystal mineral specimens) ... Click on any natural quartz crystal specimen image below to enlarge it. ... Additional Rock Crystal Quartz Item Categories in our Virtual Gallery...
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www.mineralminers.com/html/rkxmins.stm
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PART 2: Rock Type Samples ... 1. fine (small) or absent crystals; crystal sizes vary ... Rock Type & Subtype...
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www.uwsp.edu/geo/faculty/heywood/geog101/labs/RockType/...
www.uwsp.edu/geo/faculty/heywood/geog101/labs/RockType/RockType.htm
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jmu edu, fichter, quartzite: Hi Trenton, A lot of questions here but it really boils down to a specific rock type. You ask which rock has mostly crystal grains, could be medium or coarse grained, has no layers. it is light colored, can scratch glass and that would be GRANITE (this... ... More Geology Answers; ... ; You are here:
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en.allexperts.com/q/Geology-1359/Kind-Rock-1.htm
en.allexperts.com/q/Geology-1359/Kind-Rock-1.htm
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