orthopyroxene

A group of pyroxene minerals that have crystallized in the orthorhombic system. Examples include enstatite and hypersthene.
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orthopyroxene

any of a series of common silicate minerals in the pyroxene family. Orthopyroxenes typically occur as fibrous or lamellar (thin-plated) green masses ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/o/34

Orthopyroxene

Any of several pyroxene minerals that crystallize in the orthorhombic system.
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