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As one of the properties in minerals, there are different types of luster as there are different mineral categories. Luster is divided into two categories namely nonmetallic and metallic. Metallic minerals tend to have a shiny and opaque appearance. There are various sub-categories of luster in nonmetallic minerals.
The precise cause of the coin's shiny surface, or mint luster, is what we call flow lines; these are microscopic patterns in the metal where the molecules have been forced to line up in certain ways. These flow lines are easier to see on larger coins than on smaller ones.