angaralite
noun
an·gar·a·lite
anˈgarəˌlīt
plural -s
: a mineral Mg2(Al, Fe)10Si6O29 consisting of a magnesium aluminum iron silicate and occurring in thin black plates (specific gravity 5.6)
Word History
Etymology
German angaralith, from Angara river, U.S.S.R., its locality + German -lith -lite
First Known Use
1899, in the meaning defined above