1·Welded tuff is commonly rhyolitic in composition.
焊接凝灰岩在组成上通常为流纹岩。
2·The Lubaka tuff does not contain minerals that can be dated radiometrically.
路贝卡凝灰岩并不包含能通过放射性来确定年代的矿物质。
3·Typical features of subaqueous volcanic rocks include perlite with glassy structure and pillow structure, lamellar tuff, bentonite.
水下喷发火山岩典型标志为珍珠岩、玻璃质结构、枕状构造、纹层状凝灰岩和膨润土。
4·Thus the preferential exploitation of the vitric tuff in high level is synthesis of zeolite molecular sieves and a series of products made from the synthetic zeolites.
因而，沸石分子筛的合成及其系列产品开发是玻屑凝灰岩深层次开发利用的优先发展方向。
5·The acidic tuff section owns gold element with average content of 110.
其中的酸性凝灰岩段金元素平均值110。