ˈlȯŋbəˌnīt noun
( -s )
Etymology: Swedish långbanit, from Långban, Värmland, Sweden, its locality + Swedish -it -ite
: a hexagonal mineral (Mn,Sb,Ca,Fe,Mg)O 8 (SiO 4 )(?) occurring in iron-black prismatic crystals consisting of a manganese, iron, and antimony silicate and oxide (hardness 6.5; specific gravity 4.92)