Table 3.

Main mineralogical phases of natural soils obtained through XRD

Mineral	Chemical formula	Concentration level
		SA	SB	SV
Quartz	SiO2	Major	Major	Major
Calcite	CaCO3	Major	Major	Major
Muscovite	KAl2(AlSi3O10)(OH)2	Major	Major	Major
Illite-2M2	(K,H30)Al2(Si3Al)O10(OH)2·H2O	-	Major	-
Vermiculite-2M	Mg3.41Si2.86Al1.14O10(OH)2(H2O)3.72	-	Trace	-
Kaolinite	Al2(Si2O5)(OH)4	-	Major	-
Rutile	TiO2	-	Minor	-
Dolomite	CaMg(CO3)2	-	-	Major
Aluminum Oxide	Al2O3	-	-	Minor