noun Mineralogy.
a yellow-green fibrous magnesium silicate, an orthorhombic pyroxene found in norites containing less than five percent ferrous oxide.

1855–60; < Greek enstát(ēs) adversary + -ite1

enstatitic [en-stuh-tit-ik] , adjective
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World English Dictionary
enstatite (ˈɛnstəˌtaɪt)
a grey, green, yellow, or brown pyroxene mineral consisting of magnesium silicate in orthorhombic crystalline form. Formula: Mg2Si2O6
[C19: from Greek enstatēs adversary (referring to its refractory quality) + -ite1]

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American Heritage
Science Dictionary
enstatite   (ěn'stə-tīt')  Pronunciation Key 
A glassy, usually yellowish gray orthorhombic variety of pyroxene. It is usually found in igneous rocks and meteorites. Chemical formula: Mg2Si2O6.
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