“…X-ray diffraction (XRD) analysis shown in Fig. 2 confirms that the CSs are mainly composed of aragonite, a specific polymorph of calcium carbonate [ 38 ]. The indicative peaks in the XRD analysis of the cockle shell include peaks at approximately 2θ = 29.4°, 32°, 38°, 54°, 64°, and 68°.…”