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montmorillonite. there are different types of bentonite, each named after the respective dominant element, such as potassium (k), sodium (na), calcium (ca), and aluminum (al). experts debate a number of nomenclatorial problems with the classification of bentonite clays. bentonite usually forms from
weathering of volcanic ash, most often in the presence of water. however, the term bentonite, as well as a similar clay called tonstein, has been used for clay beds of uncertain origin. for industrial purposes, two main classes of bentonite exist: sodium and calcium bentonite. in stratigraphy and tephrochronology...
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