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Argillaceous minerals : ウィキペディア英語版 | Argillaceous minerals Argillaceous minerals may appear silvery upon optical reflection and are minerals containing substantial amounts of clay-like components ((ギリシア語: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==
*Clay minerals
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