Interpretation of Chemical Analyses of Montmorillonites

Osthaus, B. B.

doi:10.1346/ccmn.1952.0010112

Cited by 3 publications

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References 2 publications

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“…X = average composition of various clay minerals. Montmorillonite analyses were obtained largely from Ross and Hendricks (1945), Grim and Kulbicki ( 1961) Osthaus (1955), Foster, (1954, Kerr, et al (1950), Sawhney and Jackson (1958) and a scattering of single analyses. Nontronite analyses are from Ross and Hendricks (1945) and a selection of single analyses, lllite analyses include most of those in the literature up through 1965 and several unpublished analyses by the author.…”

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Relations of Composition to Structure of Dioctahedral 2:1 Clay Minerals

Weaver

1968

Clays and clay miner.

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Abstract-A ternary plot of the tetrahedral R 8+ and octahedral R 3+ populations for the dioctahedral 2:1 clay minerals shows a broad range of compositional variation within each of the major clay minerals. The clay minerals can be subdivided on the basis of total charge, location of the charge, and the relative amounts of AI and Fe 3+ in the octahedral sheet. The division is natural and is controlled by the misfit between the tetrahedral and octahedral sheets and the need for tetrahedral rotatiorL The compositions of the tetrahedral and octahedral sheets are interdependent. Whereas muscovite has a lower limit of 1.7 AI octahedral occupancy, illite and montmorillonite have a lower limit of 1.3 A1; lower AI values result in the formation of a chain structure. YODER and Eugster (1955) outlined the observed composition range of natural 2:1 clays in a triangular diagram in which the two variables were tetrahedral R +3 and octahedral R +3. The diagram divides the various clays on the basis of the relative amounts of tetrahedral and octahedral charge. TERNARY PLOT

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