There are many possible options for the material of the coins if we depend on density alone. This is because many materials have similar density. For example, Copper (8.9 g/cm^3) and Nickel (8.9 g/cm^3). However, since we already know the most common materials that are used for minting coins we can compare between them and choose the one with the closest density to the hypothetical coin.

These materials are Brass (8.4 g/cm^3), Bronze (8.7 g/cm^3), Zinc (7.2 g/cm^3), Copper (8.9 g/cm^3), Nickel (8.9 g/cm^3), Aluminum (2.7 g/cm^3), Silver (10.49 g/cm^3) and Gold (19.32 g/cm^3).

Accordingly the most suitable material is Zinc with a density of 7.2 g/cm^3. However, it is notable that Zinc is rarely found alone in coins, but is usually a part of an alloy with some other metal. Which makes it likely that the actual material would be combination between Zinc and a lighter metal like Aluminum.
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