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ARGILLACEOUS - 2 reference results
Argillaceous minerals appear silvery upon optical reflection and are minerals containing substantial amounts of clay-like components (ἄργιλλος = clay). 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.
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Last updated on Friday September 19, 2008 at 14:34:42 PDT (GMT -0700)
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This article is licensed under the GNU Free Documentation License.
Last updated on Friday September 19, 2008 at 14:34:42 PDT (GMT -0700)
View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation
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