feldspar basalt 长石质玄武岩
This stone is actually quite rare and difficult to cut, so in many cases other types of rock were used as substitutes, for example green feldspar, basalt, and serpentine.
这个石头实际上相当稀罕和难于切割，因此在许多情形里其它类型岩石被当作代用品使用，例如绿长石，玄武岩和蛇纹石。
The fine structure of natural alkali feldspar selected from the basalt in the Hannuoba district, China was investigated by means of high resolution electron microscopy(HREM).
利用高分辨电子显微镜观察了产于河北汉诺坝玄武岩中碱性长石的精细结构。
This stone is quite rare and difficult to cut, so in many cases other types of rock were used as substitutes, for example green feldspar, basalt, and serpentine.
这个石头实际上相当稀罕和难于切割，因此在许多情形里其它类型岩石被当作代用品使用，例如绿长石，玄武岩和蛇纹石。
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