Amber

 

Color: Yellow, red, orange and brown

Mohs Hardness: 2-2

Refractive Index: 1.54

Critical Angle: 40.49

Specific Gravity: 1.05-1.096

Cleavage: None

Fracture: Conchoidal-brittle

Dispersion: None

Heat Sensitivity: Extremely high

Birefringence (double refraction): None

Crystal structure: Amorphous

 

Treatments: Amber is sometimes reconstituted from ground up amber and small pieces are "reconstituted" into larger pieces with pressure. It is difficult to spot. It is petrified tree sap.