Enstatite

Enstatite: a mineral with the chemical formula MgSiO₃. It ranges from transparent to opaque, with a vitreous luster and colors varying from gray to green, brownish, or colorless. Enstatite crystallizes in the Orthorhombic System and typically appears as elongated prismatic crystals. It is found in both igneous and metamorphic rocks.

enstatite
(Photo: John Sobolewski (JSS)/Wikimedia Commons, License CC BY 3.0)

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