Hardness Of Rock Phosphate For Grinding
Hardness of rock phosphate for of rock phosphate for grinding hydroxylapatite wikipedia hydroxylapatite, also called hydroxyapatite ha, is a naturally occurring mineral form of calcium apatite with the formula ca 5 po 4 3 oh, but is usually written ca 10 po 4 6 oh 2 to denote that the crystal unit cell comprises two entities.