Feldspar

most abundant group of minerals in the earth’s crust

Feldspar

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

Phyllonians

Igneas

Metamorphic

Specifications

COLOR Specifications COLOR
SiO2 Al2O3 Fe2O3 CaO MgO Na2O K2O TiO2 P2O5 C TOTAL COT S TOTAL PF
SUPERWHITE 70,49 18,33 0,15 0,63 0,1 9,5 0,29 0,12 0,2 0,32
WHITE 73,7 15,83 0,28 0,47 0,22 8,30 0,4 0,2 0,22 0,5
STD 71,5 17,2 0,26 0,62 0,10 8,90 0,33 0,32 0,29 0,5
NMR-16 73 16,3 0,53 0,16 0,31 8,4 0,1 0,17 0,1 1,09

Applications

The glass industry

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.

The ceramic industry

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.

Loads in applications

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.

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