Nepheline Syenites and Their Economic Uses

Nepheline syenites have been found to occur at many places in India. The rocks of the felspathoidal group, when rich in felsic constituents like alkali felspars and nepheline can be used in a variety of industries. On account of physical and chemical properties of nepheline the, rocks rich in this mineral can be used in the manufacture of glass and ceramics Besides these principal uses, finely ground nepheline can be used in heavy clay industries and as a mild polishing and grinding material. The nepheline syenites that, contain considerable amount of apatite may be used as natural phosphatic manure.Origin and occurrence of nepheline syenite in India