The rapid decay of the famous sun temple at Konark is mainly due to the use of a highly weatherable khondalite rock as the construction material. A computer based weathering model indicates that the measured porosity of 7 to 8 0n weathered khondalite could have been produced if an original rock with 3 : 1 quartz to garnet weight ratio decayed to such an extent that 70 to 900f the garnet was altered. From the kaolinite and goethite generated as weathering products, the mole fractions retained would be 0.5 and 0.1 respectively.

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