This special issue of the American Mineralogist honors the memory and life’s work of our friend, colleague, mentor, and consummate teacher of mineralogy and petrology, Charles V. Guidotti (1935–2005). These papers were largely derived from a special topical session held in his honor at the 2006 Annual Meetings of the Geological Society of America. The session provided an opportunity for mineralogists and petrologists inspired by Charlie’s example and teaching to present their latest research. Topics presented both orally and in posters included the crystal chemistry of a variety of minerals, chemical composition of metamorphic and igneous rocks, origin of unusual...

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