3 霞石正长岩的物质组分及结构构造特征霞石正长呈灰白—灰色或带肉红、灰绿色,由于暗色矿物相对含量不同而呈不均匀的斑块状。经薄片、重砂、X衍射、红外、扫描电镜及电子探针等多种测试手段,查明有30种矿物。各种类型岩石的矿物组合基本一致,均由 3 Nepheline syenite material composition and structural characteristics of Nepheline Nepheline pale gray-gray or with reddish-gray, gray-green, due to the relative content of dark mineral was uneven patchy. Thirty kinds of minerals were identified through various testing methods such as thin sheet, heavy sand, X-ray diffraction, infrared, scanning electron microscope and electron probe. The mineral assemblages of various types of rocks are basically the same, both by