Feldspars are aluminosilicates containing varying amounts of calcium, potassium, or sodium. In glassmaking, feldspar provides alumina for improving hardness, durability and resistance to chemical corrosion. In ceramics, feldspar is used as a flux, lowering the vitrifying temperature of a ceramic body during firing and forming a glassy phase. Glass and ceramics are the major end uses of feldspar. A minor quantity of feldspar is also consumed by refractory, abrasive and electrode industries
The Indian state of Rajasthan contains large quantities of potassic and sodic feldspars, much of it being oligoclase and microcline. These deposits are plentiful in Kishangarh and Jaipur districts of Rajasthan together with nepheline syenite.
Feldspars are usually found in the Ajmer district of Rajasthan. The Taragarh Hill of Ajmer and the adjoining Babugarh hill contain good deposits of commercial grade feldspar. The samples contain around 64.2% SiO2 and 21.33% Al2O3. The deposits of Lohagal are suitable for...