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Sedimentary Rock On Quartz and sedimentary rocks Silicon and oxygen the two most common chemical elements in the Earths crust combine as silicon dioxide to form the mineral quartz SEDIMENTARY ROCKS are Rocks that are formed by the compaction of sediments or by the crystallization of the dissolved minerals Quartz is the most abundant mineral in the Earths crust Quartz has been found in meteorites and in some rocks collected on the moon Quartz has the chemical formula SiO2 There are many varieties of quartz which occurs in nearly all types of igneous metamorphic and sedimentary rocks It is an essential mineral in granites granodiorites and rhyolites Metamorphism of quartz-bearing igneous and sedimentary rocks typically increases the amount of quartz and its grain size Quartz is very resistant to weathering and therefore concentrates as sandstones and other detrital rocks Most sands are weathered fragments of quartz Sandstone and quartzite are the same materials that are re-lithified compressed into rock Quartz has many commercial applications In science and industry quartz sand is used for manufacturing sandpaper and other abrasives polishing powders and soaps It is used to make building materials heat-resistant materials known as refractories and for the bearings of precision instruments Quartz sand is also used in the manufacture of porcelain glass and metal casting molds Precision-cut plates of quartz are used for frequency control in radios TVs clocks and watches Compositionally quartz is usually quite pure with only traces of other elements like aluminum sodium potassium and lithium Quartz is found as large crystals that are often beautifully colored by impurities The many varieties of quartz are due to formation of different geometric arrangements of its tetrahedral crystals This accounts for different crystal structures and therefore different physical properties To form Quartz sandstone rock particles remains of living things are deposited in the sea by rivers and waves These sediments accumulate layer by layer over thousands or millions of years forming thick
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