why is gold called precious metal?
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They're also precious because they're made from what scientists call a "precious" metal. (The other precious metals are silver and platinum.) Gold is a soft yellow metal that never rusts or tarnishes. ... But gold is precious not only because it's beautiful and costly; it's also very useful.
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gold is a very rare element, so it's more valuable than common elements such as iron. ... The other reason gold works so well as a currency is chemical -- gold is one of those metals that do not readily oxidize, so gold coins will maintain a constant weight.
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