It is the most abundant group of minerals in the earth’s crust and it comes from different rocks:
– Phyllonians: the feldspars in these rocks are mostly potassium,
– Igneas: the dominant feldspar is albite,
– Metamorphic: feldspars from this type of rock are minority.
The feldspars are alumino-silicates and its chemical composition varies according to their alkalis value and can be considered as potassium (orthoclase KAlSi3O8); sodium (albite NaAlSi3O8) or calcium (anorthite CaAl2Si2O8). The color varies depending on its composition and crystallization. It has a hardness of 4.5 to 5 in Mohs scale
|SiO2||Al2O3||Fe2O3||CaO||MgO||Na2O||K2O||TiO2||P2O5||C TOTAL||COT||S TOTAL||PF|
represents the most important market for feldspar, being used as a source of aluminum, both in packaging production and in special glasses and insulated fibers.
is the second consumer of feldspar after glass industry, consuming approximately 40 % of the total global sales. The main applications of potassium feldspar are in the sanitary porcelain and traditional ceramic sectors (white and red) as fluxes, as well as for varnishes.
for paints, asphalts, rubbers and abrasives is also a sector that requires alkali feldspars. It could also be used as abrasive after a size adjustment.