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A pyroxene mineral composed of magnesium silicate. Enstatite was first described by G.A. Kenngott in 1855. It occurs naturally in metamorphic rocks and meterorites. The mineral is usually a gray, pale green, or brown in color although a gemstone quality emerald green variety occurs rarely. Weathered enstatite can have a metallic luster and is called bronzite. Enstatite can alter to form Steatite. Steatite may also be heated to form enstatite.




Enstatite IR-ATR RRUFF R050644.png

Raman (RRUFF)

Enstatite Raman RRUFF R050644.png

Raman (RASMIN)


Synonyms and Related Terms

bronzite; Enstatit (Deut.); enstatiet (Ned.)

Physical and Chemical Properties

  • Orthorhombic crystal system with prismatic crystals commonly lamellar, fibrous or massive
  • Cleavage = distinct in two directions
  • Fracture = uneven
  • Luster = vitreous to pearly
  • Streak = gray
  • Fluorescence = inert
  • Pleochroism = weak to strong; pink to green; green to yellowish green; or brown to yellow
Composition MgSiO3
Mohs Hardness 5 - 6
Density 3.21-3.96 g/ml
Refractive Index 1.650-1.679
Birefringence 0.008 - 0.11

Resources and Citations

  • Gem Identification Lab Manual, Gemological Institute of America, 2016.
  • Wikipedia: Enstatite (Accessed Nov. 2, 2005 and Dec 2022)
  • Minerals.net: Enstatite

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