名词
中文翻译：正长岩
同义词：
['felspar', 'orthoclase', 'orthopyroxene']
例句：
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1.The metamorphic rocks in the area are mainly composed of ortho-gneiss.
该地区的变质岩石主要由正长岩组成。
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2.The mineralogy of the ortho-gneiss is characterized by the presence of plagioclase and quartz.
正长岩的矿物组成特征是存在长石和石英。
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3. The study of the ortho-gneiss has provided valuable insights into the evolution of Earth's crust.
对正长岩的研究为地球地壳演化提供了宝贵的见解。