Peridot is the gem-quality olivine mineral. The mineral, olivine, is a silicate, and its crystal structure is made up of single isolated tetrahedron crystals. This tetrahedron shapehas the same shape as Peridot's hair. Peridot is the birthstone of August, along with Sardonyx.
|Mohs scale hardness||7.0|
|Specific gravity||3.22 - 3.45|
|Refractive index||1.635 - 1.690|