Success of mechanized underground excavation through hard-rock formations depends on the efficacy of rock cutting, wherein the wear of the cutting-tool is highly impacted by the abrasivity of the rock and governs the overall techno-economic feasibility of the project. Recent efforts across the globe suggests the use of certain pre-treatment measures to alter the excavability of rocks before the application of the cutting tool. One such pre-treatment technique is the use of high temperature, as it alters the physical and mechanical behavior of rocks by inducing microcracking phenomenon such as growth of natural microcrack network and coalescence of newly developed microcracks, that ultimately reduce the overall hardness and abrasivity of rocks. Literature suggests that although the mode of thermal pre-treatment can vary between the use of either plasma-jets or micro-waves, the impact of the mode on rock abrasivity is essentially similar. In this study, the impact of thermal treatment on the abrasivity of various rock lithotypes have been analysed. Abrasivity has been determined using the CERCHAR abrasivity index (CAI) test for untreated and thermally treated specimens. It was ensured that Bundelkhand granite (BG) and Chunar sandstone (CS) specimens were subjected to rapid cooling post high-temperature treatment to simulate real-life field conditions. The thermal shock due to rapid cooling promotes crack growth and rock degradation, which subsequently influences the abrasivity of rocks. The reduction in the abrasivity with respect to the temperature is observed. As mineralogy and internal structure of rock experience alteration at high temperatures, changes in these properties have been correlated with CAI.