Peridot 
Magnesium Iron Silicate (MgFe)2SiO4
Iron and magnesium are interchangeable, so that peridot can vary from Mg2SiO4 known as Forsterite, to Fe2SiO4 known as Fayalite
Peridot, the volcanic gem, is the best known gem variety of mineral olivine, a species name for a series of magnesium-iron rich silicate minerals. Peridot is a beautiful olive green stone. It is much less expensive than green tourmaline. Typically found in volcanic rock, this varying green gemstone has occasionally been found in meteorites, and enjoys the unique distinction of being the only precious gem know to exist in outer space. More on...
Colors: Transparent lime or olive green
Lustre:
System:
Care and Treatment
As with all gems, protect peridot from scratches and sharp blows. Also avoid large temperature changes (such as leaving it be a heater vent or in a hot car). Do not clean peridot in a home ultrasonic cleaner.
Hardness
Healing
Protects against nervousness; helps alleviate spiritual fear; aids in healing hurt feelings & bruised egos; incurs strength & physical vitality; aligns subtle bodies; amplifies other vibrational energies & positive emotional outlook; helps liver & adrenal function.
Where Found
Birthstone Months
Star Stone Months
Anniversary Gemstone
Mystical Properties
Lore
Peridot is given as a symbol of fame, dignity, and protection.
Legend has it that pirates favored peridot to protect them against evil. When the peridot was set in gold it also protected the wearer from terrors in the night.
The earliest recorded production of peridot was in about 70 A.D. from St. Johns Island in the Red Sea, about 24 miles off the coast of Egypt.
Peridot is the created during volcanic action. Occasionally, Peridot crystals are found on the black sands of Hawaii.
Peridot is the US State Gemstone of Nevada
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