This project was undertaken to determine the effects of in-situ processing on oil shale minerals. The ''burn''from which the samples were obtained was carried out by Geokinetics Inc. at a site 112 km south of Vernal, Utah. Selected samples of a core which was drilled near the center of the burn were examined by Fourier transform spectroscopy. A sample of the hottest section of the ''burn''core was also examined by scanning electron microscopy. For comparison core samples from a control hole drilled about 30 m outside the retorted zone were used in a series of laboratory retorting experiments from 600 to 1000/sup 0/C. The products from the latter were examined by X-ray powder diffraction, Fourier transform infrared spectroscopy and scanning electron microsopy. Data from the above exploratory experiments led to tentative conclusions about the temperature distribution in the ''burn''core. 1 ref., 14 figs.