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The capability of Jordanian natural zeolite to remove nickel from aqueous solutions was experimentally investigated using a packed bed column. The zeolite samples were obtained from Jabal AL Aritayn in the northeast of Jordan. The effects of the initial concentration of nickel (C 0 ), the packed bed length (L) and the zeolite grain size (D p ) on the adsorption process were considered. The finding indicated that these parameters named had a significant effect on the removal of nickel by the Jordanian zeolite. The characteristic breakthrough curves of the adsorption process were measured. The Klinkenberg model was adopted to explain the kinetic behavior of the adsorption phenomena, and we attempted to fit the packed bed experimental data to the breakthrough curve. The effective diffusivity was estimated and used to predict breakthrough curves under other adsorption conditions. KeywordsZeolite in Jordan Á Breakthrough curves Á Grain deposition Á Packed bed column Abbreviations c Concentration of nickel (g/L) c F Concentration of nickel in effluent (g/L) c à Concentration in equilibrium with average loading (g/L) D i Molecular diffusivity (m 2 /s) D p Diameter of adsorbent (m) erf(x) Error function k Overall mass transfer coefficient (s -1 ) k c External mass transfer coefficient (m/s) K Adsorption equilibrium constant q Adsorption capacity (mg/g) q Average loading of adsorbent (mg/g) q à Adsorbate loading in equilibrium (mg/g) Re Reynolds number R p Radius of adsorbent (m) Sc i Schmidt number Sh Sherwood number t Time (s) u Effective velocity (m/s) u 0 Superficial velocity (m/s) Greek letters l Viscosity (Pa s) n Dimensionless distance coordinate q Density (kg/m 3 ) s Dimensionless time coordinate e Bed porosity

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Jordanian granitic rocks (JG) are highly distributed and available in huge quantities in south Jordan, Aqaba area. Granite in south Jordan (JG) is belonging to Aqaba granite complex. This study has been carried out to investigate geological and engineering properties of JG from Aqaba vicinity, south Jordan, in addition to identify and classify the different granitic rocks. 27 random samples of JG were collected from different quarries in three locations from the study area to investigate their characterization. Engineering properties of JG were tested and investigated using ultra sonic velocity test, abrasion test, flexural strength, specific gravity test, and compressive strength test. Engineering tests results show that JG has metal disk abrasion less than 21 mm, flexural strength of 16.9 Mpa, average dry specific gravity of 2.69 and very low absorption while the compressive strength results range between 60 to 90 Mpa. The results show that the engineering characterization of JG is complying with local and international specifications and standards used for classifying the decorative and building granite stones.