Abstrak
<p style="margin: 1em 0px; color: #111111; font-family: Arial, Verdana, Helvetica, sans-serif; font-size: 11.2px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fafafa;">The gold seashell is known as a source of calcium in hydroxyapatite synthesis [Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>]. The metal contents of the samples were analyzed by AAS. Then the hydroxyapatite synthesis was done through a hypothermal method. The analysis by FTR indicated the uptake on the tape 1.000 – 1.200 cm<sup>-1</sup>. XRD analysis showed a sharp peak with a high intensity on 20 = 31,79<sup>o</sup>, 27,78<sup>o</sup>, and 31,09<sup>o</sup>m. The analysis by SEM-EDS indicated that hydroxyapatite had the same particle size, elliptical shape like a bar premises with molar ratio 1.77.</p><p style="margin: 1em 0px; color: #111111; font-family: Arial, Verdana, Helvetica, sans-serif; font-size: 11.2px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fafafa;">Key words: Hydroxyapatite, hydrothermal, gold seashell</p>