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Luster
Luster is the property of minerals that shows how much or how well the mineral reflects light. Luster may also be spelled lustre.
Luster has two main categories: Metallic and Non-metallic. Pyrite, for example, has a metallic luster. Sulfur, however, does not.
Non-metallic luster has different categories too. Each of these depends on how much light is reflected. Non-metallic, or sub-metallic luster includes waxy, pearly, silky, vitreous, greasy, resinous, dull, and adamantine.
Most types of luster are self-explanatory.
Metallic: The mineral shines like a metal.
Waxy: The mineral shines like wax.
Pearly: The mineral shines iridescently, like a pearl.
Silky: The mineral shines like silk.
Vitreous: The mineral shines like broken glass.
Greasy: The mineral shines like it was coated with a layer of oil.
Resinous: The mineral shines like hardened tree sap.
Dull: The mineral shines minimally to none.
Adamantine: The mineral shines like a diamond. This is different that metallic.