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mugearite
mugearite (muːˈɡɪəraɪt) n (Geological Science) an igneous rock containing oligoclase, olivine, orthoclase, and apatitemugearite
mugearite[myü′jē·ə‚rīt] (petrology) A dark-colored, fine-grained igneous rock in which the chief feldspar is oligoclase, plus orthoclase and olivine with some apatite and opaque oxides; originates by differentiation and volcanic crystallization of the primary magma. |