The present study focuses on the kaolin deposit in Kalabsha area south Western Desert of Egypt in an attempt to determine itspossible source, tectonic setting, and weathering history by means of integrated petrographical and geochemical approaches. Thepetrographical studywas workedby microscopic investigationand supported by X-ray diffractionanalysis.X-rayfluorescence andinductively coupled plasma-mass spectrophotometry methods were used for the determination of the bulk elemental composition.Mineralogical analysis revealed that kaolinite is the main clay mineral component indicating a severe chemical weathering of Al-richsource rocksandcompleteleachingunder warm,semiaridclimatic conditions.The nonclayminerals are representedbyquartz,iron oxides and hydroxides, Ti-bearing minerals, and zircon. Geochemical data show a prevalence of SiO 2 and Al 2 O 3 and enrich-ment of Hf, Nb, Ta, Th, U, and Zr that support the kaolinitic nature of the deposits and their derivation from a felsic granitic terrain.The high values of the chemical index of alteration and the lower values of the index of compositional variability also suggest anintensive weathered source area and the geochemical maturity of the sediments. Other relevant geochemical discriminant functionsand plots reveal felsic igneous parent rock for the kaolin deposits. Q-mode hierarchical cluster analysis combined with thenormalized rare earth element patterns played a crucial role in unraveling the origin of the studied deposits. The results show thatthe most probable source rock of the Kalabsha kaolin deposits is the intense weathering of relatively proximal Adara Adatalobgranites and their similar rock types in the Arabian-Nubian Shield from the south Eastern Desert of Egypt.