Celestite ore is one of the principle economic resources of strantium element. Naturally, it contains some impurities, with the main one being the calcite mineral. In this article, the separation of celestite from calcite was conducted using attrition scrubbing based on the difference in the hardness between the two minerals. Due to the friability of calcite, it was expected to be collected in fine fraction, however, this was not the case. The observed results showed the presence of calcite in both coarse and fine fractions. A high percentage of calcite was found in the coarse fraction and decreased as the size did as well. Yet, at certain sizes its behavior was changed in that the decrease in size increased the calcite percentage. This behavior was clarified using detailed characterization of the studied sample using size analysis, x-ray diffraction, chemical analysis, and microspcopisc investigation. In addition, a detailed microscopic analysis for the products of the attrition scrubbing was conducted to explain the observed behavior.