Uranium is more common and useful.
Neptunium and plutonium are derived from uranium by nuclear reactions.
Before uranium is protactinium. After uranium is neptunium.
Chemical symbols of: Mercury - Hg Uranium - U Plutonium - Pu Neptunium - Np
Neptunium is an artificial chemical element; in the nature infinitesimal amounts of neptunium are possible in uranium ores.
Neptunium (Np)
Uranium,Plutonium,Neptunium
Assuming you mean man[made], no. Trace amounts of neptunium are found in uranium ores in Nature.
Neptunium has not minerals. It is an artificial element and in the nature is very rare, in some uranium ores.
Neptunium is an artificial chemical element but neptunium can be found also in the nature as a result of decay processes in uranium ores, only in ultratraces.
Uranium 238 is bombarded by neutrons, and forms Neptunium 238. Neptunium decays to form Plutonium 238.
Mercury, Uranium, Neptunium, Plutonium.
uranium,thorium,actinium and neptunium