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晋北大同及浑源一带,在上石炭世太原统四号煤系中,常见有洁白色的粘土岩,外貌酷似“人工熟料”,其成因与煤层的自燃作用有关。由于原岩主要矿物为高岭石故命名这种洁白色的粘土岩为“烧变高岭岩”。
In Datong and Hunyuan areas of North Shanxi Province, there are common white clay rocks in the Upper Carboniferous Taiyuan System No.4 coal seam. The appearance resembles “artificial clinker”, and its cause is related to the spontaneous combustion of coal seam. As the main rock protolith mineral kaolinite named the white clay rock as “burnt kaolinite.”