Oxyapatite

Oxyapatite is a mineral that belongs to the apatite group, characterized by the general chemical formula M10(XO4)6Y2. In the case of oxyapatite, the 'Y' site is occupied by oxygen atoms, making its ideal formula Ca10(PO4)6O. This distinguishes it from other apatites where the 'Y' site is typically occupied by halide ions like fluoride (fluoroapatite), chloride (chloroapatite), or bromide.

The structure of oxyapatite is based on a hexagonal crystal system. It is structurally related to hydroxyapatite (Ca10(PO4)6(OH)2), a major component of bone and teeth. However, the substitution of oxygen for hydroxide groups significantly alters its properties. Oxyapatite can be found naturally, though it is less common than hydroxyapatite. It has also been synthesized for various applications.

Due to the presence of oxygen in the 'Y' site, oxyapatite exhibits different chemical and physical properties compared to other apatites. For instance, its solubility and reactivity can be altered. Research into oxyapatite has explored its potential uses in areas such as biomaterials, catalysis, and as a host material for luminescence. Its synthesis allows for controlled properties, making it a subject of interest in materials science.