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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.
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 mines in Russia (1 P) This page was last edited on 1 August 2020, at 08:25 (UTC). Text is ... This page was last edited on 1 August 2020, at 08:25 (UTC).
Pages in category "Bentonite" The following 6 pages are in this category, out of 6 total. ... This page was last edited on 1 April 2018, at 17:33 (UTC).
The volcanic ash was deposited in sea water. [1] After sedimentation covered these beds the ash was slowly converted to a meta-Bentonite called Illite. [3] These layers are important because they allow very precise dating of the ash bed with K–Ar dating. Potassium 40 decays at a known rate into Argon 40. Argon is an inert gas.
The volcanic eruption that produced the Deicke K-bentonite bed which has been dated to 457.1 ±1.0, which was calculated using a concordant uranium-lead dating zircon fraction. [2] The Deicke and Millbrig eruptions have a minimal estimation of 600,000 km 2 (230,000 sq mi) covered and at least 1,122 km 3 (269 cu mi) of pre-compaction bentonite ...
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Pages in category "Bentonite mines in Romania" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. G. Gurasada mine; O.