angaralite

\\anˈgarəˌlīt\ noun (-s)

Etymology: German angaralith, from Angara river, Union of Soviet Socialist Republics, its locality + German -lith -lite

: a mineral Mg₂(Al,Fe)₁₀Si₆O₂₉ consisting of a magnesium aluminum iron silicate and occurring in thin black plates (sp. gr. 5.6)