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硫 りゅう砒銅鉱 どうこうでした
ryūdōkōdeshita

敬
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Noun
, 
Desu Copula

The polite past form of 硫砒銅鉱

1. It was thioarsenical copper ore.

Past/Perfective
, 
Polite
, 
Geology

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硫砒銅鉱でした

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