Orthopyroxene



/ˌɔːθəʊpaɪˈrɒksiːn/
noun
1.
a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene
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.

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