However, they are accompanied by less stable clay minerals, such as vermiculite in Epirus, Greece (Macleod, 1980), vermiculite, montmorillonite, and interstratified clay minerals in Spain (García-González and Recio, 1988), chlorite in Sardinia, Italy (Boero et al., 1992), smectite, vermiculite, and mixed-layer clay minerals in Rabat, Morocco (Bronger and Bruhn-Lobin, 1997), vermiculite, low-charged vermiculite or highly charged smectite, chlorite, and mixed-layer clay minerals in Istria, Croatia (Durn et al., 1999), as well as chlorite and mixed-layer chlorite-vermiculite in western Herzegovina, Bosnia and Herzegovina (Durn et al., 2014). Kaolinite and illite have been found in the clay fraction of terra rossa soil from Epirus, Greece (Macleod, 1980), Spain (García-González and Recio, 1988), Sardinia and NE Italia (Boero et al., 1992), Rabat, Morocco (Bronger and Bruhn-Lobin, 1997), Istria, Croatia (Durn et al., 1999), and western Herzegovina, Bosnia and Herzegovina (Durn et al., 2014).
The composition of the clay fraction of the terra rossa soils in the Mediterranean region may vary considerably.
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