Nakamuta, Yoshihiro

A regularly interstratified chlorite/vermiculite was found at the surface of an outcrop of talc-chlorite vein which developed in a serpentinite body at Torika, Saipi-Cho, Nagasaki Prefecture, Japan. The regularly interstratified chlorite/vermiculite, which is regarded as a weathering product of Al-poor Mg-chlorite with IIb polytype on the basis of its mode of occurrence, was investigated by x-ray, chemical, infrared and thermal methods together with the parent chlorite. The regularly interstratified chlorite/vermiculite forms an intimate mixture with chlorite in varying proportions, and seems to be a relatively stable intermediate phase in the weathering process of chlorite. The chemical and x-ray properties of the regularly interstratified chlorite/vermiculite suggest the preferential removal of alternate hydroxide sheets of chlorite during the weathering Process. The regularly interstratified chlorite/vermiculite gives hkl reflections, which have been indexed in terms of an orthohexagonal cell (α=5.34, b=9.25, c=28.8Å). The 20l intensities are interpreted as a stacking sequence composed of Iαvermiculite and IIb chlorite layer types

A Regularly Interstratified Chlorite/Vermiculite in a Talc-Chlorite Vein

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