Notes

Gerardo
Preciado
Period 2
December 14,2017

Quartzite

From German Quartzite is a hard, nonfoliated metamorphic rock which was originally pure quartz sandstone Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression with in orogenic Belts. Pure quartzite is usually white to grey, through quartzite often occur in various shades of pink and red due to varying amount sot nonoxide fec 03 other colors such as yellow green blue and orange,are due to other minars. When sandstone is cemented to quartzite, the individuell quartz crystals.

Most or all of the original texture and sedimentary structures of the sandstone are erased by the metamorphism. The grainy, sandpaper like surface becomes glass in appearance. Minor amounts of former cementing materials, iron oxide silica, carbonate and clay often migrate during recrystallization and metamorphosis. This causes strakes and lenses to form within the quartzite.

Ortho is a very pure quartz sandstone composed of usually well rounded quartz grains cemented by silica. Orthoquartzite is often 99% SIO2 with only very minor amounts of iron oxide and trace resistant minerals such as zircon rutile and netite. Although few fossils are normally present, the original texture and sedimentary structures are preserved. The term is also traditionally used for quartz-cemented quartz arenites, and both usages are found in the literature.

The typical distinction between the two ( since each is a gradient into the other) is a metamorphic quartzite is so highly cemented, diagent altered and metamorphosed so that it will feature and breast across grain boundaries, not around them. Quartzite is very resistant to chemical weathering and often forms viges and resistant hilltop. The nearly pure silica content of the rock provides little soil therefore, the quartzite ridges are often bare or converted only with a very thin layer of soil and (if any) little vegetation. Quartzite is the result of sandstone and the mineral quartz being put under extreme heat and pressure. At least ninety percent of quartzite rock is quartz. Quartzite is usually white or a light shade of pink or gray.

Quartzite is a metamorphic rock formed when quartz rich sandstone or chert has been Exposed to high temperatures and pressure such conditions fuse the quartz grains together forming a dense hard, Equigranular rock. Quartz is the most abundant and widely distributed mineral found at earth's surface. It is present and plentiful in all parts of it is abundant in igneous metamorphic, and sedimentary rocks. Quartzite is a decorative stone and may be used to cover walls as flooring, and stairstep. It’s used for countertops in kitchens is expanding rapidly,because of its hardness and angular shape, crushed quartzite is harder and more resistant to stains than granite. Quartzite is a metamorphic, granite. Quartzite is a metamorphic,or changed, rock changes in rocks are a slow process, resulting in an altered appearance and form as a result of different conductions. Temperature, pressure and of chemically changed environments are the usual catalysts change in metamorphic.
Although most quartzite are metamorphic, some sedimentary in origin, resulting from cementation of quartz sandstone by groundwater solution containing pure.
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