While mineral dissolution in aqueous solution is widely recognized as a key regulator of water quality in the environment, mineral dissolution in non-aqueous liquid phases is not well understood. Traditionally, sorption is considered as the main mechanism of mineral-NAPL interaction, and mineral surface reactions generally are not believed to occur in NAPLs. Our original experimental observations, however, suggest otherwise - mineral dissolution and overgrowth do happen in NAPL liquids and vapors. For example, the dissolution of calcite in liquid benzene has been estimated to be 2.3(±0.3) 10-6 mol·m-2·day-1 (Fig. 1). At this rate, dissolution will consume all the calcite particles having diameters smaller than 23 mm, which are not uncommon in soils, sediments, and the atmosphere, within a year. Our results have important implications for understanding the transport and transformation of NAPL contaminants at hundreds of thousands of Superfund, RCRA, underground storage tank, brownfields and oil sites in the United States.