Minerals of the kaolinite group are distinguished from other clay or non-clay minerals by their high contents of Al2O3, high Al / Si ratio, relatively high Lost of Ignition (LOI), associated with the dehydroxylation process of the clay minerals, and low alkali content, since these elements are normally eliminated during primary kaolinitization process.
Where to find Kaolinitic Clays?
There are several favorable environments in nature for the occurrence of kaolinitization process: Hydrothermal processes, related to those areas where rocks of acid / acid-medium composition undergone a transformation process resulting from the action of hydrothermal fluids that ascend to the surface by existing faults in the upper crust. All these factors put together gives […]