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enstatite |
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enstatite [ˈɛnstəˌtaɪt] n (Earth Sciences / Minerals) a grey, green, yellow, or brown pyroxene mineral consisting of magnesium silicate in orthorhombic crystalline form. Formula: Mg2Si2O6 [from Greek enstatēs adversary (referring to its refractory quality) + -ite1]
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Orthopyroxene forms in primitive (high-MgO) basalts but as differentiation proceeds, it is replaced by pigeonite once the enstatite component falls below 60 to 70 atomic percent. That mineral also predominates in a group of meteorites called enstatite achondrites. Thermometry of the A15/4 diopside using the enstatite solvus (Nimis & Taylor 2000) indicates at least 42% of grains in the diamond zone. |
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