Peridot (Olivine)
| Category |
| Peridot |
| Crystal Form |
| Orthorhombic |
| Moh's Scale Hardness |
| 6.50–7.0 |
| Specific Gravity |
| 3.27–3.37 |
| Refractive Index |
| 1.64–1.69 |
| Sources |
| It was originally found on Egypt's St. John's Island, once known as Topazios, in the Red Sea, which is now known as Zeberget. |
Periodt is a stone with a sparkling pale green colour. Peridot has long been associated with light, the ancient Egyptians called it the "gem of the sun". It occurs in lime green, yellowish green, oliver green, or medium dark green colour.
People in the Middle Ages wore peridot to gain foresight and divine inspiration. Legend has it that pirates favored peridot to protect them against evil. Peridot was greatly prized by Egyptian Kings. Some of Cleopatra's emeralds were in fact peridots.
Inclusions
Peridot have very few inclusions. However, magnification sometimes reveals dark chromite crystals that look like ting black spots. These spots might be octahedral in shape and are often surrounded by tension fractures. Magnification may also reveal reflective disk-like liquid-and-gas inclusions often referred to as "lily pads".
Treatment
Peridot may be treated with filling techniques, using oiled or opticoned to reduce the visibility of flaws.
Caring
Do not clean peridot with ultrasonic cleaner.
Protect peridot from scratches and sharp objects.
Avoid drastic temperature changes.