Apatite

Ca5(PO4)3(F,Cl,OH) | Mohs 5 | Hexagonal crystal system

Apatite is a group of minerals composed of calcium phosphate, and it can be found in various colours, including green, blue, yellow, and violet, depending on trace elements present. The blue color of Blue Apatite is primarily due to trace amounts of iron or cobalt within its crystal structure. It is a hexagonal crystal system mineral, typically forming in prismatic or tabular crystals.