Characteristics of CHA; A. Particle size distribution of micro-CHA analyzed using PSA; the mean size of the particles is 39.98 μm (SD: 4.21 - 80.97 μm); B. The FTIR analysis of micro-CHA shows functional groups of OH-, CO32- and PO43-; C. The XRD analysis of nano-CHA shows the prominent diffraction peaks formed at the diffraction angle of 31.74°; D. The particle size distribution of nano-CHA analyzed using SEM at 10.000x magnification; the particles were of spherical shapes, a few particles were joining together to form agglomerates with the size of agglomerates ranging 82.68 - 153 nm.