A coin with a density of 5.71 g/cm^3 could consist of a variety of materials. Coins are often made of multiple materials that are mixed together, or having a coating of one material over another. In such a case, the density would depend on the ratio between multiple materials. Coins are typically made of metals that have a higher density, such as nickel (8.9 g/cm^3), copper (8.9 g/cm^3), or zinc (7.1 g/cm^3). Such a coin may contain lighter materials such as such as Aluminum (2.7 g/cm^3), Magnesium (1.7 g/cm^3), or even Titanium (4.5 g/cm^3).
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