An investigation of amesite with x-rays discloses that the mineral cannot be a simple chlorite. It has essentially a kaolinite structure, with which a few chlorite units are interstratified. As chlorites increase in Al at the expense of Si, there is a shrinkage normal to the basal cleavage. Reasons for this decrease as well as for the instability of the chlorite structure when the ratio of trivalent ions to Si reaches a certain value are suggested.

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