ホーム > Term: blue metal
blue metal
A term used in England for a hard bluish-gray shale or mudstone lying at the base of a coalbed and often containing pyrite.
- スピーチの一部 noun
- 産業/ドメイン 炭鉱
- カテゴリ 炭鉱全般; Mineral mining
- Government Agency: USBM
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作成者
- ed.young
- 100% positive feedback
(Milwaukee, United States)