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X-ray diffractograms of clay SCS samples with Cr (VI) 3000 mg/kg and different amounts of Carbofill E: 1–10% 2–20%. The peaks were identified and assigned as follows: (○) quartz (hexagonal) SiO2 83–539; (▲) wollastonite 2M (monoclinic) CaSiO3 84–655; (△) wollastonite 2M (monoclinic) Ca3(Si3O9) 76–1846; (●) calcium chromium oxide (hexagonal) Ca5(CrO4)3O0.5 38–294.
