tuff

The ore-bearing rock is composed mainly of andesitic tuff and tuffite.

作者层中首次发现了层状电石岩。

Research shows that the dawsonite in Hailaer Basin exists in both the eroded volcano tuff and sedimentary volcano tuff,and is paragenous with corrensite and allevardite frequently.

研究表明,海拉尔盆钠铝石存于火山凝灰岩或沉积凝灰岩中,常与柯绿泥石和钠板石共生,形成凝灰质蚀变特征标型物组合。

Subaqueous volcanic rocks mainly comprise glassy lava, crystal vitric bedded/sedimentary tuff, bentonite/illite/montmorillonire/zealite.

常具枕状、球状构造，水平层理、粒序层理、变形层理；

Zhaocun bentonite deposit oringnated from tuff rich in volcanic hyalocrystalline,which underwent hydrolysis and alteration in Changxing county,Zhejiang province.The deposit has middle scale.

浙江省长兴县赵村膨润土是由富含火山玻璃质凝灰岩原水解蚀变形成膨润土床,床具中型规模。