Peridot

Péridot is the name given to the Olivine when it is used in Joaillerie like Semiprecious stone.

History

The peridot crystals were probably exploited as of the thousand-year-old Ier before J. - C. in the small island of Zabargad, located in Red Sea close to the peninsula of Short-nap cloth Banas.

This island was formerly called Topazos, and the cross dedicated it to Saint- Jean (from where its other name Saint-John), but were unaware of his richnesses so much the secrecy well was kept and hidden the abroads. Because Zagarbad contains the peridot layer historically most famous and most important.

It is abandoned today.

Layers

The reserve apache of San Carlos, close to the Gila river in Arizona (the United States) is currently the principal peridot producer.

Physical and optical characteristics

  • crystalline System: orthorhombic

  • Chemical composition: (Mg, Fe) 2SiO4
  • Color: Green yellowish, green olive
  • Hardness: 6,5 - 7,0 on the specific scale of hardness Mohs
  • Revolved: 3,32 - 3,35
  • Index of refraction: 1,65 - 1,69
  • Dispersion: 0,020
  • Pleochroism: colorless, green yellowish, green
  • Pierre of birth: August

Simple: Peridot

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