Adamantine luster describes what?

Adamantine luster describes what?

• A. The lowest degree of luster
• B. Moderate luster
• C. The highest degree of luster
• D. No luster

Answer: (C)

Luster describes how light reflects off a mineral’s surface, and adamantine luster is the brightest category. It produces a diamond-like, highly brilliant sheen, with strong reflections and excellent dispersion. This extreme shine comes from minerals with very high refractive indices, such as diamond and a few others like some forms of sphalerite. Because of its intense, brilliant glow, adamantine luster represents the highest degree of luster, far beyond dull, glassy, or moderate-brightness appearances.

Luster describes how light reflects off a mineral’s surface, and adamantine luster is the brightest category. It produces a diamond-like, highly brilliant sheen, with strong reflections and excellent dispersion. This extreme shine comes from minerals with very high refractive indices, such as diamond and a few others like some forms of sphalerite. Because of its intense, brilliant glow, adamantine luster represents the highest degree of luster, far beyond dull, glassy, or moderate-brightness appearances.