In the heart of the San Carlos Apache tribal lands of Arizona, just a few miles east of Globe, Arizona, is one of the richest, perhaps the largest, source of green gem peridot in the world. The gem is a rich green to the yellow-green color found in xenoliths of basaltic lava.
Peridot is the gem form of olivine but what is really odd is olivine is not a mineral. If you read Fleischer’s Glossary of Mineral Species, which many use, olivine is not listed. This is because the name’s general use is given to a solid solution series of two minerals, fayalite and forsterite.