Amethyst Galleries
Amethyst Galleries: Mineral Galleriy: What Is Luster?
Mineral Galleries provides not only a definition of luster, but also a list of common terms used to describe this mineral property.
San Diego Natural History Museum
San Diego Natural History Museum: Mineral Matters: Luster
A brief introduction to identifying a mineral by its luster. Examples of terms used to describe luster, such as metallic, glassy, and dull are listed.