Table 1 Chemical composition of representative evaporitic samples from group 1 to 4 before and after slaking with distilled water and groundwater.

Sample ID#	Slaking fluid	wt. (%)	CaO	SO₃	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	K₂O	Fe₂O₃	TiO₂	Ti	Cl	Mn	Sr	Ba	Zr
Group 1 (L15—37–1)		Before slaking	47.644	51.275	0.000	0.510	0.112	0.155	0.014	0.000	0.013	0.003	0.002	0.139	0.000	0.087	0.021	0.001
	Distilled water	After slaking	46.876	52.165	0000	0.577	0.106	0.019	0.060	0.000	0.003	0.000	0.000	0.031	0.000	0.130	0.004	0.001
	Groundwater*	After slaking	44.418	49.807	0.623	0.887	0.089	0.039	0.000	0.116	0.005	0.000	0.000	3.838	0.000	0.130	0.001	0.001
Group 2 (L11–31–1)		Before slaking	47.120	50.682	0.576	0.524	0.123	0.584	0.000	0.041	0.101	0.040	0.024	0.155	0.000	0.075	0.018	0.024
	Distilled water	After slaking	46.380	51.753	0.853	0.585	0.125	0.064	0.047	0.000	0.022	0.000	0.000	0.031	0.000	0.094	0.017	0.001
	Groundwater*	After slaking	43.661	49.498	2.404	0.778	0.07	0.05	0.000	0.105	0.006	0.000	0.000	3.282	0.000	0.095	0.018	0.001
Group 3 (L5–23–8)		Before slaking	47.478	50.527	0.038	0.904	0.159	0.438	0.021	0.054	0.067	0.033	0.020	0.214	0.001	0.107	0.022	0.028
	Distilled water	After slaking	46.989	51.867	0.068	0.623	0.082	0.030	0.048	0.000	0.014	0.000	0.000	0.097	0.000	0.129	0.023	0.001
	Groundwater*	After slaking	46.773	48.599	0.000	0.835	0.080	0.051	0.031	0.164	0.011	0.000	0.000	3.281	0.000	0.113	0.016	0.001
Group 4 (L4–22–3)		Before slaking	48.514	44.660	0.000	2.008	0.342	2.342	0.011	0.208	0.400	0.075	0.045	1.329	0.005	0.111	0.033	0.051
	Distilled water	After slaking	45.802	50.911	1.265	0.839	0.093	0.352	0.000	0.062	0.082	0.005	0.003	0.369	0.001	0.175	0.012	0.002
	Groundwater*	After slaking	44.592	46.220	1.687	0.944	0.071	0.25	0.082	0.203	0.058	0.002	0.001	5.65	0.000	0.180	0.019	0.001
Total sample = 4

*Groundwater specification: Groundwater level = 10–40 m, Temperature = 21.5–31.2 (\(^\circ \)C), Salinity = 20,000–65,000 (ppm), pH = 7.14–9.45, TDS = 32,700–175,360 (ppm), EC = 28,100–274,000 (μ mhos/cm).

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