Assertion: biological apatite | /r/HasAspect | chemical formula of ca
Facets:
Source sentences:
text: Biological apatites have a chemical formula of Ca 5 (PO 4 ) 3 (OH), with some degree of CO 3 2 − substitution for PO 4 3 − , F− for OH−, and Na+ or Mg2+ for Ca2+ ions.