In this study, rock minerals of natural stone were finely polished with loose abrasive and ELID technology to study the surface behaviours. After these rock specimens were polished to ultra smooth surfaces, the surface characteristics were observed with microscope and analyzed with surface texture analyzer. It was found that the calcite and fluorite minerals could be polished to high surface quality with fine loose aluminum oxide abrasive. But ultra smooth quartz surface must be finished with superabrasive ELID polishing technology. The weakly acidic coolant might bring chemical damage to calcite and fluorite minerals under the condition of ELID polishing process.