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When minerals of the kaolin group are heated at constant rates there are two principal heat effects, a broad, pronounced endothermic effect near 5.'50 0 C and a sharp, intense exothermic effect near 950 0 C. New evidence, based largely on X-ray patterns of the kaolin minerals and of artificial alumina-silica gels after various heat treatments, leads to the following conclusions: (1) The endothermic effect is due to the dissociation of the kaolin m inerals into water vapor and an intimatedoi:10.6028/jres.014.037 fatcat:7ed7ufuwbbbfjp4vy6buwmvv3m