Abstract Kijing are clams that live in fresh water, and have two parts, namely the meat which is widely used in the form of food, while the shell is still underutilized. The kijing shells of the mussel contains calcium and phosphate which may be hydroxyapatite. Hydroxyapatite Ca10(PO4)6(OH)2 is the mineral component of composer bones and teeth. The purpose of this study was to characteristic c…