babingtonite
noun
bab·ing·ton·ite
ˈbabiŋtəˌnīt
plural -s
: a greenish black mineral Ca2(Fe,Mn)Si5O14OH consisting of a silicate of iron and calcium occurring in triclinic crystals (hardness 5.5–6)
Word History
Etymology
William Babington †1833 English mineralogist + English -ite
First Known Use
1824, in the meaning defined above