Peridot
Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem. Yellow-green gem variety of the mineral olivine. Found as nodules in volcanic rock, occasionally as crystals lining veins in mountains of Myanmar and Pakistan, and occasionally inside meteorites.
Birthstones & Anniversaries
Peridot is the birthstone for August and the 15th anniversary gemstone.
Facts
Mineral: Olivine
Chemistry: (MgFe)2SiO4
Colour: Yellowish green
Refractive index: 1.65 to 1.69
Birefringence: 0.035 to 0.038
Specific gravity: 3.34
Mohs Hardness: 6.5 to 7
