Hy′per-sthene
(hī′pẽr-sthēn)
,
[Gr.
ὑπέρ
over +
σθένοσ
strength: cf. F.
hyperstène
.]
(Min.)
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.