Final answer:
Luster in geology describes how light reflects off a mineral's surface, categorized into metallic and non-metallic lusters.
Explanation:
Luster in geology refers to the way light reflects off the surface of a mineral. It can be classified into metallic and non-metallic lusters. Metallic luster resembles the color of metals like gold, while non-metallic lusters vary from vitreous to earthy.
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