Hydroxyapatite is an apatite mineral compound which has a crystalline phase of a stable polycrystalline calcium phosphate compound. This research was carried out to synthesize hydroxyapatite from blood clam shells composited with SiO2. The synthesis of hydroxyapatite was carried out by the Sol Gel method. The HAp:SiO2 composite was characterized using XRD to determine 2θ, crystal size and crys…