りゅう砒鉄鉱 てっこうではありませんでした
ryūtekkōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 硫砒鉄鉱

1. Was not thioprasite.; Was not thioarsenopyrite.

Past/Perfective
Negative
Polite
Formal Register
Geology