Feldspars are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth’s continental crust by weight. Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock.Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite.Feldspars are also found in many types of sedimentary rocks.****Potassium Feldspar is an important tectosilicatemineral which forms igneous rock. It is a common constituent of most granite and other felsicigneous rocks and often forms huge crystals and masses in pegmatite. Feldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber. In glassmaking, alumina from feldspar improves product hardness, durability, and resistance to chemical corrosion. In ceramics, the alkalis in feldspar (calcium oxide, potassium oxide, and sodium oxide) act as a flux, lowering the melting temperature of a mixture. Fluxes melt at an early stage in the firing process, forming a glassy matrix that bonds the other components of the system together.
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Shk. Hozefa Ezzi
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