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orthopyroxene

/ˌɔːθəʊpaɪˈrɒksiːn/
noun
1.
a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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orthopyroxene in Science
orthopyroxene
  (ôr'thə-pī-rŏk'sēn')   
Any variety of the mineral pyroxene that crystallizes in the orthorhombic system and contains no calcium and little or no aluminum. Enstatite is an orthopyroxene.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for orthopyroxene

any of a series of common silicate minerals in the pyroxene family. Orthopyroxenes typically occur as fibrous or lamellar (thin-plated) green masses in igneous and metamorphic rocks and in meteorites.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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