Argillaceous

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English: :Argillaceous components are fine-grained (less than 2 µm) aluminosilicates, and more particularly clay minerals such as kaolinite, montmorillonite-smectite, illite, and chlorite. Clays and shales are thus predominantly argillaceous.

The adjective "argillaceous" is also used to define rocks in which clay minerals are a minor but significant component. For example, argillaceous limestones are limestones consisting predominantly of calcium carbonate, but including 10-40% of clay minerals: such limestones, when soft, are often called marls. Similarly, argillaceous sandstones are sandstones consisting primarily of quartz grains, with the interstitial spaces filled with clay minerals.

español: :Arcilloso, su composición principal es la arcilla.