A Comparative Study of Two Samples of Khangat Sidi Nadji Biskra Rocks

Abstract

This study examines two rock samples from Khangat Sidi Nadji in Biskra, employing a range of techniques including X-ray fluorescence, Fourier transform infrared spectroscopy, X-ray diffraction, and thin-slice technology. These methods were utilized to identify the crystal phase, crystal system, space group, and unit cell for the different compositions present in the two samples. The fluorescence analysis clearly indicated that sample R01 comprises 98% quartz, while sample R02 possesses a notably higher proportion of calcite. This distinction was further supported by the Fourier transform infrared technique, revealing the prevalence of quartz in the most absorbent areas of the first sample and a contrasting presence of calcite in the second sample. These findings aligned seamlessly with the X-ray diffraction results processed through the X'pert Highscore program. Sample R01 exhibited a high concentration of quartz with a hexagonal crystal structure under space group P3₂21, whereas sample R02 predominantly showcased calcite with a rhombohedral crystal structure under space group R-3c. Subsequently, to validate these outcomes comprehensively, the thin blades technique was applied to the rocks. The confirmed results mirrored those obtained through earlier methodologies, solidifying the understanding that despite originating from the same region, these two samples possess distinct appearances and compositions.