Rare metal

Japanese: rare metal(英語表記)raremetal
Rare metal

...These metals, including steel, aluminum, copper, zinc, and lead, are called common metals, and are translated as mass-produced metals or ordinary metals.
[Rare metal]
Metals that are not mass-produced but are industrially important are collectively called rare metals. The term is used to mean metals that are essential to support the advanced level of modern industrial technology, but the definition is somewhat ambiguous.

*Some terminology explanations that mention "rare metal" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これらの鉄鋼,アルミニウム,銅,亜鉛,鉛あたりまでをコモンメタルcommon metalと呼んでおり,量産金属,普通金属などと訳している。
[希少金属rare metal]
 量産金属以外の金属で工業的に重要な金属を総称して希少金属または希有金属と呼ぶ。現代の高度な工業技術水準を支えるのに必要不可欠な金属といった意味で使われ,定義にはあいまいなところが残される。…

※「rare metal」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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