A group of important rock-forming
Common pyroxenes belong to either the low-calcium enstatite-(ortho)ferrosilite series, (Mg,Fe)SiO 3 , or the high-calcium diopside-hedenbergite series, Ca(Mg,Fe)Si 2 O 6 . Rare pyroxenes include {{link=jadeite">jadeite , aegirine , and johannsenite. See also enstatite .