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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.
List of countries by bauxite production: Bismuth [8] China Vietnam: List of countries by bismuth production: Copper [9] Chile Peru: List of countries by copper production: Chromium [10] South Africa Turkey: List of countries by chromium production: Gold [11] China Australia: List of countries by gold production: Iron ore [12] Australia China
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List of countries by bentonite production; A. Ayilo; D. Deicke and Millbrig bentonite layers; S. Smectite This page was last edited on 1 April 2018, at 17:33 (UTC ...
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.
Mexican President Claudia Sheinbaum announces 25% tariffs on American imports in retaliation of Trump's tariffs on the country. China–United States relations, China–United States trade war. U.S. President Donald Trump announces 10% tariffs on goods imported from China. China vows to take the matter to the World Trade Organization.
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