Apatite is a very common mineral, but transparent gemstone-quality apatite is extremely rare. Despite the fact that apatite is the defining mineral for 5 on Mohs scale of hardness, the gemstone remains virtually unknown to most, and is seldom found in jewelry stores. However, because apatite occurs in such a wide variety of attractive colors and forms, it is a favorite among gemstone collectors. The name 'apatite' was derived from a Greek word meaning 'cheat'. It was given its name because of its close resemblance to several other gemstones that are often more valuable. As a result, apatite became unfairly labeled as the deceitful stone.