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Potassium feldspar, which is used widely in the ceramics Feldspar Stone comprises a group of minerals containing potassium, sodium, calcium and aluminum silicates. It is the most common rock-forming minerals. The common feldspar is potassium feldspar, namely, orthoclase (K2O, Al2O3, 6SiO2). Sodium Feldspar is Albite (Na2O, Al2O3, 6SiO2) and Calcium Feldspar is Anorthite (CaO, Al2O3, 2SiO2). A variety of crossed, hatched, twinned orthoclase (to be seen under the petro logical microscope only) is called microcline. Sodium and Calcium Feldspars form a somorphous mixture known as plagioclase feldspars
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