> This is unenriched uranium—it has the same ratio of U238 to U235 found in all natural samples of the metal. I don’t know what else to say about it except that, as one would expect, it is extraordinarily dense.

Uranium is slightly less dense than gold and tungsten, but the difference is small, so when taken in hand, like in TFA, the sensation should be the same as for gold or tungsten.

There are 6 metals that are denser than gold: osmium, iridium, platinum, rhenium, neptunium and plutonium.

The maximum density of a substance at normal pressure and temperature is not reached in a pure metal, but in a certain alloy of osmium and iridium.

The natural alloy of osmium and iridium, which is found as nuggets in alluvial deposits, together with gold nuggets, is the substance that was originally called "adamant" by the Ancient Greeks. Only many centuries later, after the expedition of Alexander the Great in India, diamonds became known to Europeans and they were named "Indian adamant", hence the modern name "diamond" for them. The original "adamant" was forgotten, and osmium and iridium were rediscovered at the beginning of the 19th century, by separating them from platinum minerals. Platinum is one of the few chemical elements which were not discovered in Europe or Asia, but it was discovered by the natives of South America, long before the contact with Europeans.