Sodium Feldspar (N-SPAR)

What is Sodium Feldspar?

Sodium Feldspar is a white/off white/pink colored mineral which majorly contain sodium, alumina, silica, potassium and calcium.
Its ideal chemical formula is Na2O.Al2O3.6SiO2, However in real occurrence it is found as KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 associated with K2O and other oxides as well but Na2O being in higher percentage than K2O so it is called Sodium Feldspar.
Sodium Feldspar has Mho's scale hardness of 6.0-7.0 and density of 2.6. Sodium Feldspar is also called as Soda Feldspar, Albite Feldspar, N-spar, Na-Spar, Na-Feldspar. It is classified as Plagioclase Feldspar. .

Uses of Sodium Feldspar:

Being low in Silica and high in Alumina and Alkali, sodium feldspar is good fluxing agent. It has wide uses in many industries for fluxing properties. However, good quality Sodium feldspar is used for glass production, ceramic manufacturing in body and glaze uses. Sodium Feldspar with low Na2O (6 to 9%) is used in vitrified tiles and Sanitaryware body purpose while Sodium Feldspar with high Na2O (9 to 12%) is used for glazing purpose.
Traditionally Sodium Feldspar was not used much due to its unpredictable expansion nature during firing process but now a day ceramists are widely using it as it melts at low temperature and provides very white glaze look after firing. For more details on sodium feldspar as ceramic glaze kindly visit this page on Mr. Tony Hansen's website Digitalfire.

India, Rajasthan and Sodium Feldspar:

Soda Feldspar is found in many countries in world but from last 20-25 years its exploration has increased in India. Several new deposits have been identified and quarries have been developed. Along with potassium feldspar South India has some deposits of Sodium feldspar as well but North India state Rajasthan not only has bigger deposits but also has very high quality with Na2O ranging from 6 to 12%. Sodium feldspar is particularly found in Aravali Hill range in districts like Bhilwara, Ajmer, Rajsamand, Udaipur, Jaipur, Tonk and Sikar etc.

Minnovation Corp and Sodium Feldspar:

Being a leading supplier of various ceramic raw materials, Minnovation Corp owns one mining lease of sodium feldspar, it has area of 7 acres and near village Shambhugarh in Bhilwara district. Material of our lease contains 10+% Na2O, approx 18% Al2O3 and 60+ fired whiteness. Our daily production is around 80 to 100 MT per day, out of which we use 40 ton for our plants and rest of the row materials is sold to other grinding plants in market like Beawar.
We maintain an inventory of minimum 1500 ton raw sodium feldspar lumps at our plants for smooth functioning of plants and consistent quality production. At our plants we produce around 1200 MT powder per month. Our plants have triple magnets to remove as much Iron as possible. We can produce powder from 80 mesh to 325 mesh and can pack it in 25 KG bags to 1400 KG bags.
We have some grades of Sodium Feldspar which are very suitable for: Ceramic Glazing.
Metallurgical uses (fluxing agent).
Vitrified tiles manufacturing.
Glass Manufacturing.
Engobe Frit.
Ceramic items manufacturing (Sanitaryware, tableware).

For TDS of Sodium Feldspar please refer to below table:


CHEMICAL PROPERTIES SF01-A SF01-B SF02 SF03
Silica (SiO2) 69±1 % 70±2 % 70±2 % 71±2 %
Alumina (Al2O3) 18±1 % 17±1 % 16±1 % 15±1 %
Potassium Oxide (K2O) < 0.5 % < 1.00 % < 1.00 % < 1.00 %
Sodium Oxide (Na2O) 10.5±0.5 % 10.5±0.5 % 9+ % 8+ %
Calcium Oxide (CaO) < 0.5 % < 0.8 % < 0.8 % < 0.8 %
Ferric Oxide (Fe2O3) < 0.06 % < 0.06 % < 0.08 % <0.20%
Magnesium Oxide (MgO) < 0.30 % < 0.50 < 0.50 Max. < 0.50 Max.
Titanium Oxide (TiO2) < 0.01 % < 0.02% < 0.02% < 0.02%
Loss on Ignition LOI (950oC) < 1.00 % < 1.00 % < 1.00 % < 1.00 %
Fired Whiteness (1220 oC) 60+ 55+ 60+ 60+

Sodium Feldspar
Ceramic Glaze


Feldspar. Quartz. Silica.

#Miner, Manufacturer, Exporter of Sodium Feldspar powder,#low temperature ceramic glaze, #Albite Feldspar.