orthopyroxene

/ (ˌɔːθəʊpaɪˈrɒksiːn) /

noun

a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene

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Scientific definitions for orthopyroxene

orthopyroxene
[ ôr′thə-pī-rŏksēn′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.