Beneficiation Process of Kaolinite Clay: Kaolin Processing
The most common origins of kaolin were from the alteration of such source minerals as feldspar, granite, and gneiss during the warm, wet environments between the early Tertiary (50 million years) and Cretaceous (135 million years) Eras. Kaolin is found in primary (or insitu) and secondary (sedimentary) sites on all continents.