Chlorohydroxyapatite

Chlorohydroxyapatite is a chemical compound with the formula Ca₅(PO₄)₃(OH,Cl). It belongs to the apatite group of minerals, which are characterized by the general formula A₁₀(XO₄)₆Z₂ where Z is typically fluoride, chloride, or hydroxide. In chlorohydroxyapatite, calcium ions form the A sites, phosphate ions form the XO₄ sites, and a mixture of hydroxide and chloride ions occupy the Z sites. This mineral is a solid solution, meaning that the proportion of chloride to hydroxide can vary.

Chlorohydroxyapatite is found naturally in some geological formations. It is also a synthetic material produced for various applications, particularly in biomedical fields. Its structural similarity to biological apatites, such as hydroxyapatite found in bones and teeth, makes it a subject of interest for biomaterials research. For example, it has been investigated as a component in bone grafts and dental materials due to its potential for osseointegration and biocompatibility. The presence of chloride can influence its solubility and reactivity compared to pure hydroxyapatite. Research continues to explore its properties and potential uses in areas such as mineral processing and environmental remediation.