#noble_metal__noblemetal  any metal that is resistant to corrosion or oxidation
  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.
  subtype:  Au__gold__atomic_number_79  a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
     subtype:  gold_dust  the particles and flakes (and sometimes small nuggets) of gold obtained in placer mining
     subtype:  green_gold__greengold  a gold alloy (at least 14 karat gold with silver or silver and cadmium) that has a green appearance
     subtype:  guinea_gold  22-karat gold from which guinea coins were made
  subtype:  platinum__Pt__atomic_number_78  a heavy precious metallic element; gray-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits
  subtype:  Ag__silver__atomic_number_47  a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography
     subtype:  coin_silver  a silver of the degree of purity established for making legal silver coins

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