. Bulletin of the British Museum (Natural History), Mineralogy. Unhealed. 30 29 30" 2e(CuKa) 29- Fig. 5. Diffractometer traces of feldspars from pseudoleucite rocks (left) and traces of heat-treated Madagascar microcline (right). For explanation of groups 1 to 4 see Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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