Soil samples were tested for Calcite and Dolomite using XRD analysis. some Iraqi soils have low levels in Calcite that might approaches to zero, and that does not mean it has zero level of Carbonate because the decrease in a major compound of this group (carbonate) will be on the expense of the other compound. Besides, dolomitization is no less importance than Calcification in Iraqi soils where it was in recent or paleo occurrence of these minerals. There was a highly significant Pearson correlation between Calcite and Dolomite contents in soils (significant at 0.01 level) that shows that the increase of one component will be on the expense of the other component, and here is an evidence for the occurring of Dolomitization process in soil. Studied soils showed higher content of carbonate minerals, where some soils showed zero content of calcite minerals with higher content of dolomite 31%. Soil salinity showed varied range where the lowest value was 0.85 dS m-1, while the highest value was 95.12 dS m-1. Inceptisols which located to the north of Iraq, showed the highest content of calcite as compared to the other locations while Mollisols showed the least content of calcite.
