The transition of kaolin to metakaolin was obtained at about 500 C. However, full conversion to metakaolin required a much higher temperature (950 C) for 45 min. Holmes et al. reported the direct conversion of Nigerian kaolin without any pretreatment into pure zeolite A [11]. In this case, the authors optimized the use of the impurities during the synthesis of the zeolite A. They prepared the synthesis solution with the composition of 3.75 Na2O:Al2O3: 2.1 SiO2: 243.7 H2O. The reaction mixture was then hydrothermally treated in an autoclave for 3 h at 100 C. Metakaolinwas obtained at 650 C in 10min. Nevertheless, the performance of the obtained zeolite A as a potential detergent builder or adsorbent was not evaluated, i.e., cation exchange capacity was not reported. In a recent report, Wang et al. achieved the synthesis of zeolite A from commercial kaolin without calcination [12]. However, this new hydrothermal route involves a strong acid treatment.