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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, have been used for clay beds of uncertain origin. For industrial purposes, two main classes of bentonite exist: sodium bentonite and calcium bentonite.
Bentonite layers from an ancient deposit of weathered volcanic ash tuff in Wyoming Gray shale and bentonites (Benton Shale; Colorado Springs, Colorado). Bentonite (/ ˈ b ɛ n t ə n aɪ t / BEN-tə-nyte) [1] [2] is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite.
The English name reflects the historical use of the material for fulling (cleaning and shrinking) wool, by textile workers known as fullers. [1] [2] [3] In past centuries, fullers kneaded fuller's earth and water into woollen cloth to absorb lanolin, oils, and other greasy impurities as part of the cloth finishing process.
The term smectite is commonly used in Europe and in the UK while the term montmorillonite is preferred in North America, but both terms are equivalent and can be used interchangeably. For industrial and commercial applications, the term bentonite is mostly used in place of smectite or montmorillonite.
Pickerington Ponds is a 1,608-acre (651 ha) park with several trails and 5 overlooks for bird and other wildlife watching. [18] A State Nature Preserve in Southeast Columbus, this park was first acquired in 1986. It is primarily focused on providing a habitat for various birds and contains many wetland areas.
Pickerington Ponds Metro Park is a metropolitan park in Pickerington and Columbus, Ohio, owned and operated by Columbus and Franklin County Metro Parks. The park has 1,608 acres (651 ha) with several trails and five overlooks for bird and other wildlife watching. [ 1 ]