James Madison University
James Madison University: Mineral Luster
Mineral photos depicting metallic and non-metallic luster. Includes shiny, glassy, and earthy examples.
Other
Webmineral.com: Mineral Luster
This site lists thirty different terms for describing the luster of minerals.
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.