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硫りゅう砒鉄鉱てっこうでした
ryūtekkōdeshita

敬
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Noun
, 
Desu Copula

The polite past form of 硫砒鉄鉱

1. It was thioarsenopyrite.

Past/Perfective
, 
Polite
, 
Geology

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硫砒鉄鉱でした

硫砒鉄鉱でした【りゅうてっこうでした】 Activity
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