Murray, Haydn H. Department of Geological Sciences, Indiana University, Bloomington, Indiana.
Last reviewed:October 2019
- Mining and processing
- Kaolinitic clays
- Diaspore clay
- Palygorskite clays
- Miscellaneous clays
- Related Primary Literature
- Additional Reading
Clays used as raw material in manufacturing. Commercial clays are among the most important nonmetallic mineral resources. The value of clays is related to their mineralogical and chemical composition, particularly the clay mineral constituents kaolinite, montmorillonite, illite, chlorite, and palygorskite (the preferred name is palygorskite, but many producers and users still use the term attapulgite). The presence of minor amounts of mineral or soluble salt impurities in clays can restrict their use. The more common mineral impurities are quartz, mica, carbonates, iron oxides and sulfides, and feldspar. In addition, many clays contain some organic material. See also: Clay minerals
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