This mineral occurs most notably in Durango, Mexico and Bancroft, Ontario, and may exist with fluorine, chlorine, or a hydroxyl group at the center of its crystal structure.  
This mineral's name comes from the Greek meaning "to deceive" because of its common confusion with olivine, peridot, and beryl.  While it typically exists in a hexagonal prism, a cryptocrystalline variety exists known as collophane.  This mineral occurs most notably in Durango, Mexico and Bancroft, Ontario, and may exist with fluorine, chlorine, or a hydroxyl group at the center of its crystal structure.  FTP, identify this phosphate mineral with a Mohs hardness of 5 that sounds like it might be the hungriest of rocks.
This mineral's name comes from the Greek meaning "to deceive" because of its common confusion with olivine, peridot, and beryl.  
apatite