QUARTZITE

usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by included minerals. It results from the metamorphism of pure quartz sandstone. It is most easily distinguished from sandstone by the fact that it fractures across its constituent grains of sand, while sandstone fractures along the line of the cementing material between the grains of sand. Although most quartzites are metamorphic, some are sedimentary in origin, resulting from cementation of quartz sandstone by groundwater solutions containing pure quartz.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Quartzite
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books on: Quartzite  - 485 results

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...them is called quartzite. The cement in...usually quartz. Quartzites are very dense...erosion, and thus quartzite usually forms topographic...prominences. Most quartzites are very ancient...underground excavation in quartzite requires large...difficult to drill. Quartzites are commonly interbedded...
...these 11065, fig. 46 , k is of gray quartzite skillfully flaked on both surfaces to...deep came two unworked flakes of gray quartzite 11052 the edges of which show wear...36 deep, the predominating form is a quartzite dart point with a more or less flat base...
When quartzite was used, it may have been worked in the easiest manner. Of the five quartzite core-forms, four show splits or...of initiating fracture in the local quartzites. Quartzite cobbles thrown against an anvil or...
...materials including andesite, diorite, quartzite, sandstone, and siltstone. The assemblages...Gallegos District see Figure 6.4 . Quartzite, sandstone, chalcedony, and obsidian...bedrock exposures and as float material. Quartzite, chert, and silicified wood are common...
...type Locally available? 5 Popham Bay Ferruginous quartzite Flake Y 6 2 Trepang Bay Silcrete Flake N 7 Trepang Bay Pink quartzite Grindstone N Sandstone Manuports Y 9 Knocker Bay Pink quartzite Grindstone N Sandstone Manuports Y 10 3 Minto Head...
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journal articles on: Quartzite  - 299 results

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...and new data on synthetic quartzite, deformed under conditions...intracrystalline plastic flow of quartzite (the preferred flow laws...experimentally heat-treated quartzite. High temperature plastic...tectonic grain size reduction, quartzites are likely to deform dominantly...
...points are generally made of quartzites knapped from the cortical...through sandy ground. Black quartzite was called ngalat it twinkles...igneous intrusions and the quartzites that make up the bulk of the...is made of fine-grained quartzite (not chert). Quartzite...
...these gravels is Potter member quartzite (Figure 2). This material...fine-grained Potter member quartzite, and smaller cobbles of coarse...that the coarse-grained quartzites typically were selected to...frequency of Potter member quartzite at these gravel exposures...
...jasper," gray "quartzite," white-tan "quartzites," tan-gray...the large gray quartzite biface from Schwert...northern Wisconsin quartzites, but concluded...eastern Wyoming area quartzites, with Morrison quartzite the most likely...
...underlying Slieve Tooey Quartzite Formation (Fig. 5). These older quartzites (together with the...and exotic, cleaved quartzite clasts within quartzites forming the immediate...underlying deformed quartzite sequence. The occurrence...
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magazine articles on: Quartzite  - 46 results

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...km long, crystal cavern of pink and amber quartzite. "Roraima Sur Cave is the longest quartzite cave in the world," says Barton. Most...explain how Roraima Sur was carved out of quartzite, which is highly resistant to chemical deterioration...
...intermixed with particles and small rocks of quartzite--confront plants with a desertlike...Sadler suspects that the red clay and quartzite pebbles were laid down millions of years...sediment. Erosion continues to carry some quartzite pebbles down the slopes of Gold Mountain...
...remains. These were simple, flaked quartzite tools, such as choppers and chopping...remains of temporary hunting camps. Quartzite pebble choppers are not much to look...chipped-stone choppers and chunks of quartzite used as a source of raw material also...
...particularly vulnerable to air pollution; CENTRE LEFT: a quartzite vein folded in rocks that formed 750-600 million years ago...drifting together to form the supercontinent Pangaea, the quartzite would have formed as sandstone crystallised as a result of...
...with a rotary blade, the works were extracted from blocks of quartzite, travertine, Black Portoro limestone, and Rose of Portugal...limestones metamorphism into marble, sandstones metamorphism into quartzite, and waters erosion of stone. The image appeared as an analogue...
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newspaper articles on: Quartzite  - 50 results

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...The countertops are a stone called quartzite that looks like creamy marble with taupe...the wall by the sink and range. The quartzite on the island is dark greens with blues...bath. They used the same dark green quartzite for the counters, and the floor is huge...
...made stone used in countertops and quartzite is another," Lederer said. "Both...has the same drawbacks as silestone and quartzite with regard to heat and a homogeneous...synthetic stone materials like silestone and quartzite, with Corian coming in third. "At...
...Japanese version of crazy paving, although each piece of quartzite has been cut to a template in the contemporary Japanese style...Box, trees and shrubs from Coblands (01483 480450). . Quartzite for paving and rocks, granite for stepping stones and welsh...
...it a unique look. Its more on the rustic side," she says. Other natural stones, such as slate, gray quartzite and copper quartzite are also popular choices. Homeowners whose primary goal is to preserve the integrity and traditional feel...
...detail involved: "A North West residential pool made from quartzite stone imported from Switzerland featuring freeboard, deck...Wellness, believes that the commitment to quality - the Swiss quartzite stone was up to pounds 60,000 of the residential pools cost...
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encyclopedia articles on: Quartzite  - 6 results

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QUARTZITE usually metamorphic rock composed of firmly cemented quartz grains. Most...line of the cementing material between the grains of sand. Although most quartzites are metamorphic, some are sedimentary in origin, resulting from cementation...
...by wind action into ridges called dunes. Sandstone and quartzite rocks are indurated masses of sand, and sand deposits are sometimes formed by the weathering of sandstone and quartzite formations. Sand is used extensively in the manufacture...
...the earth (see metamorphism ). Some (e.g., marble and quartzite ) are massive in structure; others, and particularly those...e.g., mica schist and hornblende schist), gneiss , quartzite, slate , and marble. Bibliography See H. Blatt et al...
...sometimes greenish or black rock composed of quartz and fledspar with numerous fragments of other rocks, such as shale, slate, quartzite, granite, and basalt. Sandstone may be crushed to the form of loose sand grains, which can then be put to the same industrial...
...the Sambhar-Sirohi and the Sambhar-Khetri ranges, the hills contain a variety of minerals, including large amounts of quartzite. Most of the hills are 1,000 to 3,000 ft (300 to 900 m) in elevation and from 6 to 60 mi (10 to 100 km) in width...
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