felsite造句

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.