grey manganese
(US gray manganese) Mining (now rare )
noun
(Also grey manganese ore) either of two minerals containing manganese, manganite and pyrolusite.
Origin
Late 18th century.
| 单词 | grey manganese |
| 释义 | grey manganese(US gray manganese) Mining (now rare ) noun (Also grey manganese ore) either of two minerals containing manganese, manganite and pyrolusite. Origin |
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