Orthopyroxene definitions

ôr'thə-pī-rŏk'sēn'
Any of a number of varieties of pyroxene that crystallize in the orthorhombic system and contain no calcium and little or no aluminum.
noun
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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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