The extrusion of silica - rich lava, the Rooiberg felsite, occurred on a grand scale.富于 硅氧 的岩流及罗依山霏细岩的喷出作用占据了广大面积.The ore bodies are confined to Yanshanian metamorphosed rhyolite porphyry and felsite.矿体赋存在燕山期变质流纹斑岩、霏细岩中....

n.霏细岩，致密长石...

felsite的音标：felsite的英式发音音标为：['felsaɪt]felsite的美式发音音标为：['felsaɪt]...