(ˈhɜːsɪˌnaɪt) n (Geological Science) mineralogy a black, opaque mineral of the spinel series
hercynite
hercynite
[′hərs·ən‚īt] (mineralogy) (Fe,Mg)Al2O4 A black mineral of the spinel group; crystallizes in the isometric system. Also known as ferrospinel; iron spinel.