Ha. So I searched with the first phrases, and there are multiple results that are identical. But then there's this :"In theory, as its density is 19.1g/cm3, which is approximately 70% denser than lead, uranium could be used as material of making fake coin. However, it is weakly radioactive and not as dense as gold, so it does not appear to be a practical method. Then people have discovered that tungsten is environmental-friendly, durable and hardness, the most important is that its density of 19.25g/cm3 is just about the same density as gold (19.3g/cm3), which bears the similar specific gravity." So I guess someone copy pasted a mistake that someone did when shortening the original version.

http://news.chinatungsten.com/en/tungsten-dart-news/46-tungs...