Four different microalgal strains named arbitrarily as A, B, C and D strains capable of growing in Ci enriched conditions were isolated from marble mining site, Alwar, Rajasthan, India. Out of the four isolates, strain B showed vigorous growth at 100 mM NaHCO3 concentration, though the other microalgal strains A, C and D also survived, their growth declined after a few days of inoculation (Fig. 1). Substantial growth of the isolate B (ISTGA1) in the presence of 100 mM NaHCO3 clearly indicates that it can efficiently utilize excess of Ci provided in the form of sodium bicarbonate (NaHCO3) and sequester it in the form of increased Tipiracil which can be further used for producing some value added product such as biodiesel. Existence of Scenedesmus sp. on marble/dolomite/limestone along with other microalgae is widely reported (REF). Bicarbonate and carbonate ions are the major source of inorganic carbon in such ecological niches, thus microalgae inhabiting such places are naturally adapted to thrive on high Ci/CO2 concentrations. Not only that, such species thriving as epiliths on rocks also produce biofilm composed of EPS containing polysaccharides, lipopolysaccharides, proteins, glycoproteins, lipids and glycolipids which could be additional source of lipids and other value added products . From this perspective, microalgae growing on marble/dolomite/limestone can be potential candidates for CO2 sequestration and biodiesel production.