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Common silicate mineral in the pyroxene family. It is the stable form of magnesium silicate (MgSiO, often with up to 10% iron) in magnesium- and iron-rich igneous rock types. Enstatite crystallizes in the orthorhombic system (three unequal axes at right angles to each other).
This entry comes from Encyclopædia Britannica Concise. For the full entry on enstatite, visit Britannica.com.