Dicalcium phosphate is the calcium phosphate with the formula CaHPO4 and its dihydrate. The "di" prefix in the common name arises because the formation of the HPO42– anion involves the removal of two
Ca2 from JCS A Curry, N.A.; Jones, D.W.
A portion of the lattice of dicalcium phosphate dihydrate, highlighting the 8-coordinated Ca2+ center and the location of the protons on three ligands (green = calcium, red = oxygen, orange = phosphorus, white = hydrogen)