Merge this question into. Split and merge into it. Answer by Faukerz. Confidence votes 276. The luster of a mineral is the way its surface reflects light. Most terms used to describe luster are self-explanatory: metallic, earthy, waxy, greasy, vitreous (glassy), adamantine (or brilliant, as in a faceted diamond).uster refers to how a mineral reflects light. It is usually metallic, glassy, or dull. Luster can also used to describe different kinds of minerals.