Grossular Luster
Optical Properties of Grossular 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. Grossular optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.
Grossular luster is the quantity of light the crystal reflects when light is incident on it. Grossular which is commonly found in Green, Brown, Brown, Colorless, Green, gray, Yellow color, is Gemmological Tables (2004) More from other references in nature. It possess Greasy and Vitreous luster.