Feldspar is by far the most abundant group of minerals in the earth's crust, forming about 60% of terrestrial rocks. Most Egyptian deposits offer potassium feldspar as well as sodium feldspar and mixed feldspars.

Feldspars are primarily used in industrial applications for their alumina and alkali content.

Feldspar minerals are essential components in igneous, metamorphic and sedimentary rocks, to such an extent that the classification of a number of rocks is based on feldspar content. The mineralogical composition of most feldspars can be expressed in terms of the ternary system Orthoclase (KAlSi3O8), Albite (NaAlSi3O8) and Anorthite (CaAl2Si2O8).

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