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Enstatite
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==Identification== Enstatite and the other orthorhombic pyroxenes are distinguished from those of the monoclinic series by their optical characteristics, such as straight extinction, much weaker [[double refraction]] and stronger [[pleochroism]].<ref name="EB1911"/> They also have a prismatic [[cleavage (crystal)|cleavage]] that is perfect in two directions at 90 degrees. Enstatite is white, gray, greenish, or brown in color; its [[hardness]] is 5β6 on the [[Mohs scale]], and its [[specific gravity]] is 3.2β3.3. This prismatic form is used in gemstones, and for academic purposes.
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