Discussion
It is customary to describe common pyroxenes in terms of four end members : diopside, hedenbergite, enstatite, ..................
Answer: A
The fourth end member is ferrosilite.
Common pyroxenes are plotted in the pyroxene quadrilateral with four end members: diopside (CaMgSi2O6), hedenbergite (CaFeSi2O6), enstatite (Mg2Si2O6) and ferrosilite (Fe2Si2O6). Enstatite and ferrosilite are the magnesium and iron ends of the orthopyroxenes.
Ferropericlase is a magnesium-iron oxide of the lower mantle, not a pyroxene. Fayalite (spelt 'faylite') is the iron olivine, and jadeite (spelt 'jadite') is a sodium pyroxene outside the four-member quadrilateral.
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