Enstatite (Mg₂Si₂O₆) is the magnesium end-member of the orthopyroxene group and a major rock-forming mineral in mantle peridotite, gabbro, and meteorites. Its name from Greek “enstates” (resistant) reflects its refractory nature. Enstatite is one of the most common minerals in stony meteorites and is paired with forsterite in upper-mantle assemblages.
Key Facts
- Mohs hardness 5–6.
- Orthorhombic; differs from clinopyroxenes in symmetry and ~88° cleavage angles.
- Forms continuous series with ferrosilite (Fe endmember).
- Major component of mantle peridotite (alongside olivine).
- Abundant in chondritic and enstatite-class meteorites.
Notable Localities
Bamble (Norway) is the type-locality. Mogok (Myanmar) yields gem-quality crystals. Stillwater Complex (Montana, USA) hosts massive Enstatite ore.
Found at these Localities
- Mogok Stone Tract (抹谷宝石产地)
