Lustre is the way in which the mineral reflect lights and has nothing to do with color. A mineral’s lustre can be classified as shiny, vitreous, metallic, dull, waxy or pearly to name a few of the most popular. The metals that are the shiniest are either from the adamantine or metallic group.
Adamantine minerals reflect light the best (have a high refractive index). The best example is a diamond.
Minerals with a metallic lustre can also be considered shiny and have the outward appearance of polished metal and often reflect light like a mirror would. Examples are galena, pyrite and magnetite.
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