n.霏细岩，致密长石
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.
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.
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