The peridot has a glass-like, oily luster. It is very sensitive to acids and can easily break up under strong tension. Dark stones can be lightened by heating.

PERIDOT
Colour: yellow-green, olive green, brownish
Mohs hardness: 6.5-7
Density: 3.28-3.48
Transparency: transparent
Fracture: small-muscled, brittle