Transmission electron microscopy; wonesite from the Post Pond Volcanics, Vermont. A new method of deriving the chemical compositions of the phases in fine lamellar intergrowths from electron microscope X-ray analyses is described. The method, which utilizes the bulk chemical analysis of the intergrowth as a standard, is used to derive the chemical compositions of the intergrown talc and mica. The exsolution of wonesite provides a structural analogy for amphibole exsolution phenomena that involve the amphibole A-site.--Modified journal abstract.

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