Abstract
Publisher Summary Kaolin minerals occur widely as products of hydrothermal alteration and weathering and as constituents of sediments. These minerals are important raw materials for the ceramic, paper, and other industries, and are mined in many places. The chapter reviews the occurrence and properties of kaolin minerals, and the discussion of their genesis. The kaolin minerals consist of kaolinite, dickite, nacrite, and halloysite. Kaolinite is an important hydrothermal mineral and occurs abundantly in hydrothermally altered rocks. Kaolinite has been reported from weathered rocks of various geological ages. The intensely kaolinized rocks have been mined for kaolin clay, which is composed mainly of kaolinite associated with minor amounts of halloysite, alunite, etc.. The chapter examines that all halloysites are in a fully hydrated state if they are examined without prior drying. The chapter explains that the halloysite can be formed only by the dehydration of halloysite.
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