Abstract
IT has been customary to classify the groups of layer silicate minerals as trioctahedral or dioctahedral according as all the octahedral ion sites in the lattice are occupied, or only two sites out of three. Virtually all minerals in the layer silicate groups fall clearly into one of these two divisions, the number of octahedral sites per unit cell occupied being usually nearly round numbers.
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YOUELL, R. Isomorphous Replacement in the Kaolin Group of Minerals. Nature 181, 557–558 (1958). https://doi.org/10.1038/181557a0
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DOI: https://doi.org/10.1038/181557a0
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