enstatite
noun
en·sta·tite
| \ ˈenztəˌtīt, ˈen(t)stə-\
plural -s
Definition of enstatite
: an orthorhombic mineral MgSiO3 of the pyroxene group consisting of magnesium silicate usually occurring massive and varying from grayish white to olive green and brown — compare bronzite
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