1987 Volume 27 Issue 2 Pages 53-61
Geology and mineralogy of kaolin deposits and kaolinitic clay deposits are reviewed. They are classified as follows.
1. Deposits of primary kaolin
1.1 Deposits of combined hydrothermal-weathering origin
1.2 Residual deposits mainly formed by tropical weathering
1.3 Solfataric deposits formed by shallow hydrothermal action
2. Deposits accompanied by sandy sediments
2.1 Sedimentary kaolin deposits
2.2 Kaolinitic sand with kaolinization either before or after sedimentation
3. Kaolinitic clay deposits accompanied by coal or lignite
3.1 Ball clay, i. e., plastic carbonaceous clay
3.2 Fireclay including high-alumina fireclay and flint clay
3.3 Tonstein and allied clay of volcanic-ash origin
