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Montmorillonite
Si4Al1. 5Mg0. 5O10(OH)2Ca0. 25 An aluminium silicate (smectite) with a 2:1 layer structure composed of two silica tetrahedral sheets and a shared aluminium and magnesium octahedral sheet. Montmorillonite has a permanent negative charge that attracts interlayer cations that exist in various degrees of hydration thus causing expansion and collapse of the structure (i.e., shrink-swell). The calcium in the formula above is readily exchangeable with other cations.
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- Part of Speech: noun
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- Industry/Domain: Earth science
- Category: Soil science
- Company: Soil Science Society of America
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