#uranium__U__atomic_number_92  a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  supertype:  metallic_element__metal  any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
  substance of:  uraninite
  subtype:  uranium_235__uranium235  a uranium isotope with mass number 235; capable of sustaining chain reactions
  subtype:  uranium_238  the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239

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