specular iron; specularite
A mineralogical term for a variety of hematite with a shiny, mirror-like surface. Used in geology and mineralogy contexts.
Specular iron is a mineral with a mirror-like luster.
Compound of 輝 (ki, 'shine') + 鉄鉱 (tekkō, 'iron ore'), literally 'shining iron ore'. The reading きてっこう follows standard on'yomi.