Montmorillonite
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Montmorillonite is a very soft phyllosilicate group of minerals that form when they precipitate from water solution as microscopic crystals, known as clay. It is named after Montmorillon in France. Mo
A sample of montmorillonite
Clay mineral
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Clay minerals are hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations found on or near some planetary surfaces.
Oxford Clay (Jurassic) exposed near Weymouth, England
Hexagonal sheets of the clay mineral kaolinite (SEM image, 1,340× magnification)
Structure of clay mineral groups