Biology: what mineral form of calcium is found in bones?
Tutoring biology, the question about calcium in bone – specifically, which mineral form it takes – might arise. The tutor discusses it.
The hardness of bone comes from the presence of hydroxyapatite:
hydroxyapatite:
Ca5(PO4)3OH
found in bones and giving them their hardness.
Source:
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.