Apatite is the mineral found in our teeth and bones, but it also comes in hundreds of other forms and is found in many types of rock. It gets its name from the Greek for “deceive”, because it is sometimes so difficult to tell what type of apatite you are looking at, or even if it is apatite at all. For example, what you are looking at right now is part of an x-ray diffraction pattern for fluorapatite, but it looks more like some mountains and trees.