| 词条 | Argillaceous minerals |
| 释义 |
Argillaceous minerals may appear silvery upon optical reflection and are minerals containing substantial amounts of clay-like components ({{lang-el|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. Claystone and shales are thus predominantly argillaceous. The adjective "argillaceous" is also used to define rocks in which clay minerals are a secondary 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. See also
References{{Unreferenced|date=January 2008}}{{DEFAULTSORT:Argillaceous Minerals}}{{petrology-stub}} 1 : Sedimentary rocks |
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