 Montmorillonite - Reference: Encyclopedia - MontmorilloniteMontmorillonite is a very soft phyllosilicate mineral that typically forms in microscopic crystals, forming a clay. Montmorillonite, a member of the smectite family, is a 2:1 clay, meaning that it has 2 tetrahedral sheets sandwiching a central octahedral sheet. The particles are plate-shaped with an average diameter of approximately 1 micrometre. The particle thickness is extremely small (~ 1 nm).
It is the main constituent of the volcanic ash weathering product, bentonite. Montmorillonite's water content is variable and it inc ...
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