Bentonite claymineral fromthe Gulbarga region belonging to the smectite group having a wide range of industrial uses was activated by different methods (such as water, chemically and thermally activated). The acid activation of the investigated bentonite increased three times the surface area and volume. This activated clay is characterized for chemical analysis (XRF). Surface area determination indicates increase in surface pore diameter. ThermalGravimetric analysis (TGA) and Differential thermal analysis indicates the decomposition of carbonates. X-ray diffraction (XRD) patterns indicate the increase in the calcium phase.