a dark-colored variety, (Mg,Fe)SiO, of enstatite, containing a large amount of iron; magnesium iron silicate
Origin of hypersthenealtered (modeled on Gr) ; from French hyperstène: coined (1803) by R.-J. Haüy (1743-1822), French mineralogist ; from Classical Greek hyper-, hyper- + sthenos, strength
A green, brown, or black splintery, cleavable pyroxene mineral, essentially (Fe,Mg)2Si2O6.
Origin of hyperstheneFrench hypersthène : hyper-, extreme (from Greek huper-; see hyper–) + Greek sthenos, strength; see segh- in Indo-European roots.