Abstract <p>This paper examines the effect of plasma modification of zeolite-containing rocks used as fillers in composite materials on their structural parameters. Changes in the structural parameters of the modified zeolite have been evaluated using X-ray diffraction analysis, IR spectroscopy, and optical microscopy. Plasma treatment was found to lead to a slight decrease in crystallite sizes, and a change in the degree of dispersion of zeolite particles was observed. The results of the study confirmed the high modifying effect of low-temperature plasma.</p>