Final answer:
Luster describes how light interacts with the surface of a mineral. Metallic and non-metallic lusters represent minerals that look like metals or not, respectively.
Step-by-step explanation:
The light reflecting characteristics of a mineral are described by its luster. Luster refers to how light interacts with the surface of a mineral. Metallic luster describes minerals that look like metals, while non-metallic luster describes minerals that do not look like metals and allow some light to pass through.