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Quartz is classified as a rock-forming mineral. ... Quartz occurs as clear or cloudy crystals in a range of colors. It's also found as massive veins in igneous and metamorphic rocks. Quartz is the standard mineral for hardness 7 in the Mohs hardness scale.
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geology.about.com/od/minerals/ig/minpicrockforming/minp...
geology.about.com/od/minerals/ig/minpicrockforming/minpicquartz.htm
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It has also been found in some lunar rocks and meteorites. The name quartz is believed to have originated in the early 1500s from the Saxon word querklufterz (cross-vein ore), which was corrupted to quererz and then to quartz.
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www.mineralgallery.co.za/quartz.htm
www.mineralgallery.co.za/quartz.htm
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Information on the mineral quartz ... It occurs in basically all mineral environments, and is an important constituent of many rocks. Quartz is also the most varied of all minerals. It occurs in all different forms, habits, and colors. There are more variety names given to Quartz than any other mineral.
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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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Quartz is composed of all silica tetrahedra where all oxygen atoms bond covalently with all silica atoms. This makes a very strong crystal, but with no planes of weakness. Thus quartz does not cleave. In felsic igneous rocks quartz is common.
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csmres.jmu.edu/geollab/Fichter/RockMin/Quartz9.html
csmres.jmu.edu/geollab/Fichter/RockMin/Quartz9.html
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The lack of soil nitrogen provided no obstacle for the plant colonies living under the quartz rocks. Hofmockel, another of Schlesinger's graduate students, found those algae obtain the nitrogen they needed for growth directly from the air like some less primitive plants are also able to do.
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www.sciencedaily.com/releases/2004/01/040106073237.htm
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Magazine article from: Rocks & Minerals ; ...recently, nearly unique fluorite specimens. These are...yellow to honey-colored fluorites. I believe that I was...the time that it was fluorite; ... Find more facts and information related to the article "Fluorite on Quartz."
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www.encyclopedia.com/doc/1G1-53285933.html
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Bestcrystals.com is the online Rock Shop of hundreds of crystals, minerals, fossils from around the world, from $1 to grade 'A' specimens. Secure ordering and world-wide shipping. ... Learn about the great volcanoes of the earth and the rocks that they produce. We have volcanic rock sets, books, and videos all about volcanoes!
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heqr.com — Today most of the quartz in watches has one-second pulses, which are driving a small electric motor that connects to gears to move the hands on the face. ... email this story ... share this story on facebook...
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digg.com/arts_culture/Advances_in_Watch_Technology_Usin...
digg.com/arts_culture/Advances_in_Watch_Technology_Using_Quartz_Rocks
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Laboratory experiments on rocks at low sliding velocity typically yield values of the friction coefficient of 0.6–0.85. Here we demonstrate that an extraordinary decrease in friction coefficient accompanies sliding of ‘room dry’ quartz rocks at rates faster than in most laboratory experiments, but slower than...
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www.agu.org/pubs/crossref/2002/2002GL015240.shtml
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