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Definition of PYROXENE
: any of a group of igneous-rock-forming silicate minerals that contain calcium, sodium, magnesium, iron, or aluminum, usually occur in short prismatic crystals or massive form, are often laminated, and vary in color from white to dark green or black
A group of important rock-forming silicate minerals of variable composition, among which calcium-, magnesium-, and iron-rich varieties predominate. Common pyroxenes belong to either the low-calcium enstatite-(ortho)ferrosilite series, (Mg,Fe)SiO, or the high-calcium diopside-hedenbergite series, Ca(Mg,Fe)SiO. Rare pyroxenes include jadeite, aegirine, and johannsenite. See alsoenstatite.