Peridot: Gem from the Stars

Some facts about this gorgeous August Birthstone:

4.5 billion

Some peridot is ancient: it's found in pallasite meteorites, remnants of our solar system's birth.


In 2005, peridot was found in comet dust brought back from the Stardust robotic space probe.


Gem variety of the mineral olivine: found in peridotite rock from the earth’s upper mantle.

  • Mineral: Olivine
  • Chemistry: (MgFe)2SiO4
  • Color: 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



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