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noble metal

Definitions of noble metal
  1. noun
    any metal that is resistant to corrosion or oxidation
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    types:
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    Au, atomic number 79, gold
    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
    Pt, atomic number 78, platinum
    a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits
    Ag, atomic number 47, silver
    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
    24-karat gold, pure gold
    100 per cent gold
    gold dust
    the particles and flakes (and sometimes small nuggets) of gold obtained in placer mining
    coin silver
    a silver of the degree of purity established for making legal silver coins
    green gold
    a gold alloy (at least 14 karat gold with silver or silver and cadmium) that has a green appearance
    guinea gold
    22-karat gold from which guinea coins were made
    type of:
    metal, metallic element
    any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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