Large scale planar geological mapping, profiling survey and microfabric analyses proved that lithophysa structure was developed in rhyolite in Yingcheng coal mine area, Jiutai City.

摘要通过大比例尺平面地续图、剖面测量和显微析，九台营城煤矿区流纹中石泡发育。

Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.

珍珠、黑耀和松脂等玻璃以酸性为主，中基性者也常见。

The first rock is mainly andesite clinkering agglomerate, andesite breccia, dacite breccia, rhyolite breccia and rhyolite clinkering tuff.

正常火山碎屑亚类石类型主要为安山结集块,安山、英安及流纹火山角砾以及流纹结凝灰。