A silica mineral with associated iron content of between 20% and 30% (Mg,Fe)SiO3
a grayish, greenish-black or brown silicate of iron and magnesium; an orthorhombic pyroxene, isomorphous with enstatite. [AHDOS
Hypersthene is a common rock-forming inosilicate mineral belonging to the group of orthorhombic pyroxenes. The name has now been formally abandoned and enstatite or ferrosilite is preferred. It is found in igneous and some metamorphic rocks as well as in stony and iron meteorites.