Composite is a material that is formed from two or more combination materials with the result that it is resulted a composite material. Hydroxyapatite is one that can be composited with chitosan as adsorbent dyes methylene blue and methyl orange. The purpose of this study was to synthesize hydroxyapatite from lokan shells (Geloina coaxans) using the microwave method with NaH2PO4 and Ca(OH)…