りゅう砒銅鉱 どうこうじゃありませんでした
ryūdō kōja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 硫砒銅鉱

1. It was not thioarsenical copper ore.

Past/Perfective
Negative
Polite
Terminal Form
Geology