1520s, from M.Fr. lustre "gloss, radiance," common Romanic (cf. Sp., Port. lustre, Rum. lustru, It. lustro "splendor, brilliancy"), from L. lustrare "spread light over, brighten, illumine," related to lucere "shine," lux "light" (see light (n.)).
luster (lŭs'tər) Pronunciation Key
The shine from the surface of a mineral. Luster is important in describing different kinds of minerals. It is usually characterized as metallic, glassy, pearly, or dull.