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University of California, Department of Chemical Engineering and Materials Science, Davis, CA, United States
The silicon-free end member of the hydrogrossular solid solution series, katoite Ca 3 Al 2 [(OH) 4 ] 3 , was synthesized in a solid-media, piston-cylinder apparatus. The enthalpy of formation from the component oxides was measured by high-temperature oxide melt calorimetry and found to be Delta H f = -255.6+ or -12.2 kJ/mol; the resulting enthalpy of formation from the elements is Delta H f = -5551.5+ or -16.4 kJ/mol. From this value, enthalpies for breakdown reactions of hydrogrossular were calculated and the relative energetic stability of katoite evaluated.
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  T. Fockenberg, M. Burchard, and W. V. Maresch The solubility of natural grossular-rich garnet in pure water at high pressures and temperatures European Journal of Mineralogy, October 1, 2008; 20(5): 845 - 855. [Abstract] [Full Text] [PDF]
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