General comment. Hydroxyapatite and its properties.
D002130:Calcium Phosphates; D055598:Chemical Phenomena; D002621:Chemistry; D002627:Chemistry, Physical; D003460:Crystallization; D003461:Crystallography; D006882:Hydroxyapatites; D008968:Molecular Conformation
D002130:Calcium Phosphates; D006882:Hydroxyapatites