Optical Properties of Polyhalite are its behavioral responses towards light. While few optical properties can be identified with naked eyes, other require special instruments by the gemologists to identify them. Polyhalite optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.
Polyhalite luster is the quantity of light the crystal reflects when light is incident on it. Polyhalite which is commonly found in Colorless, White, Red, gray, pink color, It possess Resinous and Vitreous luster.