Pic Description: 1. Cleavage: Incomplete basal cleavage 2. Hardness :7.25 7.75 emerald brittle 3. The relative density of 2.7-2.9 depending on the origin, variety and change 4. Luster: vitreous luster 5. Transparency: Transparent to translucent 6. Refractive index of 1.56 - 1.59 depending on the variety and change 7. Birefringence of 0.004 to 0.009 depending on the variety and change 8. Optical characteristics: a negative optical axis of the crystal 9. Dispersion: Low 0.014 10. Special light: the cat's eye and starlight effect 11. Color: green, blue, green, yellow, pink, no 12. Pleochroism: varies depending on the color
