Abstract
The vermiculite-like minerals show varied relative intensities of basal reflections and do not collapse fully when saturated with K and heated up to 700°C. Transmission oblique texture X-ray diffraction patterns were used to determine a continuous series of the vermiculite-chlorite intermediate structures. Relative diffraction intensities in the region (060) were correlated with the amount of water released at 500–700°C to show that the investigated samples belong to two structurally distinctive series: vermiculitic and chloritic types. The structural premises indicate that the parent mineral for the chloritic intergrades should be chlorite and that for the vermiculitic series phlogopite.
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