![hydroxyapatite crystals of Norway](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hydroxyapatite-cristaux-norvege152.png)
hydroxyapatite
As for the apatite, its name derives from the Greek to indicate that the apatite has often been confused with other gems, plus the mention of “hydroxy”added . This is a major constituent of bones and teeth.There is a very dark green variety rich in