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Smectite and illite/smectite mixed-layer clay minerals in the Ashibetsu coals
International Journal of Coal Geology, 1994Abstract Smectite, K-smectite and illite/smectite (I/S) mixed-layer minerals are found as expandable clay minerals in the Paleogene coal seams of the Ashibetsu coal mine in the Ishikari coal field, Hokkaido, Japan. As K-smectite often exists in tuff, tuffaceous shale and coal near tuff, and only occasionally in shale, the K-smectite is simply thought
Tatsuo Kimura +2 more
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Applied Clay Science, 2009
Abstract To evaluate the influence of coexistent salt in the Mg–Si precursor for the hydrothermal synthesis of smectite, stevensite was synthesized hydrothermally from Mg–Si precursors with different salt concentrations. Prepared homogeneous Mg–Si precursors were washed with distilled water before hydrothermal treatment. The salt concentration of the
Hyun-Jeong Nam +4 more
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Abstract To evaluate the influence of coexistent salt in the Mg–Si precursor for the hydrothermal synthesis of smectite, stevensite was synthesized hydrothermally from Mg–Si precursors with different salt concentrations. Prepared homogeneous Mg–Si precursors were washed with distilled water before hydrothermal treatment. The salt concentration of the
Hyun-Jeong Nam +4 more
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Pathways of Smectite Illitization
Clays and Clay Minerals, 1986AbstractJunction probability diagrams show variation in both composition and layer arrangement in mixed-layer clay minerals. These diagrams can represent short-range and long-range ordered, random, and segregated interstratifications. Mineralogical analyses of illite/smectite from shale cuttings, bentonites, and hydrothermally altered tuffs define ...
Craig M. Bethke +2 more
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Expansion of Smectite by Hexadecyltrimethylammonium
Clays and Clay Minerals, 2002AbstractThe adsorption of hexadecyltrimethylammonium (HDTMA) in smectite was studied by adsorption isotherms, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Smectites that had reacted for 48 h with HDTMA cations equivalent to 0.2–3.0 times the cation exchange capacity (CEC) were converted to HDTMA-exchanged ...
Seung Yeop Lee, Soo Jin Kim
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1988
In the words of Ross and Hendricks (1945), “Clay minerals . . . are the dominant materials of shales and surficial rocks and so are among the most important structural materials of the earth’s surface.” Clay minerals play a significant role in many aspects of life, ranging from their domination of the properties of the soils and sediments beneath us to
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In the words of Ross and Hendricks (1945), “Clay minerals . . . are the dominant materials of shales and surficial rocks and so are among the most important structural materials of the earth’s surface.” Clay minerals play a significant role in many aspects of life, ranging from their domination of the properties of the soils and sediments beneath us to
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Full Characterization of Smectites
2013Abstract Smectites are the most miscellaneous group of 2:1 clay minerals. Chemical and structural heterogeneity are typical for smectites, and both composition and structure are permanently subject to change in natural systems and technical applications.
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1978
Publisher Summary The chapter reveals that the montmorillonite is a specific mineral name of the smectite group. The mineralogy of montmorillonite and the geology and geochemistry of montmorillonite deposits have been investigated in detail. Montmorillonite deposits of economic importance are distributed only in Tertiary formations, especially in the
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Publisher Summary The chapter reveals that the montmorillonite is a specific mineral name of the smectite group. The mineralogy of montmorillonite and the geology and geochemistry of montmorillonite deposits have been investigated in detail. Montmorillonite deposits of economic importance are distributed only in Tertiary formations, especially in the
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