noun
pyrites; iron sulfide ore
Technical term in geology and mining for iron sulfide minerals, especially pyrite (fool's gold).
この地域では硫化鉄鉱が採掘されている。
Pyrites are mined in this region.
黄鉄鉱 specifically refers to pyrite (FeS₂), while 硫化鉄鉱 is a broader term for iron sulfide ores.
Compound of 硫化 (りゅうか, 'sulfuration') + 鉄鉱 (てっこう, 'iron ore').