Optical Properties of Allanite 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. Allanite optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.
Allanite luster is the quantity of light the crystal reflects when light is incident on it. Allanite which is commonly found in Brown, Black color,