Hypersthene
Pronunciation : Hy"per*sthene
Part of Speech : n.
Etymology : [Gr. hyperst?ne.] (Min.)
Definition : Defn: An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface.
Source : Webster's Unabridged Dictionary, 1913