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(or hydroxyapatite), fluoroapatite (or fluorapatite), and chloroapatite (or chlorapatite). they are named for the presence of hydroxide (oh-), fluoride ( f -), and chloride ( cl -) ions , respectively, in the crystal lattice. these three forms of apatite are not readily distinguishable, as each specimen
usually contains all three types of ions. impure, massive apatite is called phosphorite. apatite is distributed widely in igneous , metamorphic , and sedimentary rocks, often in the form of cryptocrystalline fragments. it is usually green, but blue, yellow, purple, and brown varieties have also been...
https://www.newworldencyclopedia.org/entry/Apatite