Calcite was modified with stearic acid in the "wet" and "dry" process. The results showed that the total hydrophobicity is achieved at a concentration of stearic acid 1.5% in the "wet" process, and 3% for "dry". Microscopic analysis is in accordance with the degree of coating obtained. On the basis of the infrared spectra, it was concluded that there was no change in the position and intensity of most strip of modified calcite relative to the starting sample. The X-ray diffraction analysis showed that the calcite after modifying stearic acid retains its basic structure.