Gemstones Tools

Peridot

Oval cut peridot
(per'-id'-ot)

13th c.; fre. peridon; arab. faridat

A yellowish-green variety of olivine used as a gem
Color
Light to dark yellowish green to olive green
Family
Magnesium and iron silicate
Chemical composition
(Mg, Fe)2SiO4
Crystal system
Orthorhombic
Hardness (Mohs scale)
6,5 - 7
Specific gravity
3,33 ±0,04
Refractive index
1,654 - 1,690 ±0,02
Birefringence
0,036
Optical character
Biaxial +
Chanthaburi

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