ABSTRACT
Petrographical and mineralogical ivestigation of about 100 samples representing the Egyptian Carboniferous and Cretaceous kaolin deposits collected from a number of localities reveals the presence of anatase, brookite, rutile and sphene minerals. They were authigenically crystallized in the pore-spaces as crystal aggregates embedded in authigenic kaolinite. The presence of unstable titanium-bearing minerals such as biotite detritus, inherited illmenite and other unstable pyroxene and amphibole as well as the iron oxide minerals, gypsum and anhydrite may manifest the authigenic origin of the Ti02 minerals after the inheritance of the original titanium-bearing minerals. Anatase, brookite and rutile are more common in the studied deposits.
