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Facts and Folklore by Wynn Fabbri
Peridot, the birthstone for August is a magnesium iron silicate. It is in the forsterite-fayalite mineral series which is in the olivine mineral group. Light green colored olivine is peridot, the yellowish green variety is called chrysolite. Peridot inherits it's color from iron.
The word peridot comes from the arabic word faridat which means gem. Peridot is given for 16th wedding anniversaries.
FACTS : Peridot is 6.5-7 on the Moh's hardness scale, is doubly refractive and is generally a clean, clear stone, however, it is Type II in the colored stone clarity category. When inclusions are present, they tend to be liquid and or gas inclusions called "lily pads" because they look like sideways lily pads or sometime peridot has tiny octahedral shaped chromite inclusions.
Peridot is mined from Burma, Myanmar, South Africa, Norway, Brazil, The U.S. (Arizona and Hawaii), Australia and the most important and historic site for peridot deposits, which go back to 1500 B.C., is from Zabargad, which is St. John's island in the Red Sea east of Egypt.
FOLKLORE: Christian people over the ages have thought of peridot as sacred. Catholic Bishops consider peridot a symbol of moral purity and wear rings with amethyst and peridot set in them.Peridot is thought to have a healing effect on the liver and gallbladder.