Covellite Luster
Optical Properties of Covellite 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. Covellite optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.
Covellite luster is the quantity of light the crystal reflects when light is incident on it. Covellite which is commonly found in Blue, Blue, Black color, is Handbook of mineralogy (2001) More from other references and OpaqueAnthony et al in nature. It possess Resinous luster.