[en] During the work of X ray diffraction lab several kinds of local Syrian soil samples were received, the most of them have the same main mineral contents, some samples consist of one mineral. We have got some pure samples from different Syrian places (Quartz, Calcite, Gypsum and Montmorillonite) which have been analyzed to ensure its purity.These samples were mixed in similar weights. Effect of mixing samples on the diffractograms and the percentage of the minerals has been calculated in tow methods, manually and instrumentally, correction factors needed have been fixed for the used minerals. Amorphous material has been added to the used minerals in different ratios, results showed that adding each mineral affects the intensity of the main peak. Quartz has been chosen to study the effect of adding different ratios of amorphous material, comparing diffractograms with each other showed a clear difference in the intensity of the main peak. (author)