amorphous hydroxyapatite

a·mor·phous hy·drox·y·ap·a·tite

hydroxyapatite containing ion contaminants (for example, 6-8% CO32-, 3-5% Mg2+, F-, Cl-, etc.); found in mineralized connective tissue (for example, bone, dentin, cementum). Synonym(s): poorly crystalline hydroxyapatite