noun
hematite
A mineral form of iron oxide; used as an iron ore and in pigments. Technical term in mineralogy.
赤鉄鉱は重要な鉄鉱石の一つです。
Hematite is one of the important iron ores.
From 赤 (red) + 鉄 (iron) + 鉱 (ore), referring to the reddish color of the mineral.