Gemology

Peridot’s Gemological Properties:

Chemical: Mg2SiO4, Fe2SiO4

Formation: igneous rocks

RI: 1.654 – 1.690

Birefringence: 0.036

Optic Character: Biaxial Positive

Specific Gravity: 3.30

Crystal System: Orthorhombic

MOHs Hardness: 7

Wearability: Good