We can observe shifts of peaks for modified MMT toward lower angle values, indicating an increase of aluminosilicate interlayer gallery (d-spacing) after treatment of the filler with terpenes (Fig. ). D-spacing of pristine clay is 1.25 nm (7.05°), and MMT with terpenes is ca. 1.37 -1.42 nm. The lowest shift (from 1.20 to 1.37 nm) was noted for M-PL. This phenomenon correlates with TGA results (Table ) and may be interpreted as sorption of the terpenes mixture at the lowest content. It can be related to the more complex structure of the mixture than the individual terpenes, which can lower its volatility and hinder the sorption between the MMT layers. Comparing various modifiers used, there is no great difference in the platelets gallery, whereas a significant difference was obtained from TGA. It confirmed that terpenes were not only absorbed between MMT platelets, leading to their intercalation, but some molecules were adsorbed on the clay surface, especially pinene.