Vol. 1, Issue 11, Part A (2015)

Abstract
Putting aside contents, mineralogy generally varies slightly regarding its main constituents which include quartz, potassic feldspars and kaolinite. Added to these we have iron oxides (hematite and goethite) and manganese oxide (cryptomelane). Clays are mainly dominated by the kaolin group. Illites/micas, interstratified illites/smectites and smectites are present in little quantities in the locality of Boumedje but occur as traces in Ndjola. The mineral assemblages are mainly controlled by diagenetic processes (burial, circulation of fluids). Nevertheless, the present climatic conditions are equally responsible for the formation of some minerals of the kaolinite type. A mineralogical study has led to the putting in place of mineral assemblages.