りゅう砒鉄鉱 てっこうじゃありませんでした
ryūtekkōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 硫砒鉄鉱

1. It was not thioarsenopyrite.

Past/Perfective
Negative
Polite
Terminal Form
Geology