Peridot
Variety (Mg,Fe)2SiO4
Also called Chrysolite
About it
Gem olivine in olive to lime green, with strong doubling of the back facets seen through the stone. Found in basalts at San Carlos, Arizona, on Zabargad Island in the Red Sea, and in Pakistan and Myanmar.
- Type
- Variety
- Group
- Forsterite variety (olivine)
- Formula
- (Mg,Fe)2SiO4
- Hardness (Mohs)
- 6.5–7
- Specific gravity
- 3.27–3.48
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- olive green, yellowish green, lime green
- Transparency
- transparent
- Cleavage and fracture
- poor; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.