火山凝灰岩（tuff）简称凝灰岩，是一种压实固结的火山碎屑岩。主要由粒径小于2毫米的晶屑、岩屑及玻屑组成。碎屑物质小于50%，分选很差，填隙物是更细的火山微尘。
... lapilli tuff 火山砾凝灰岩 volcanic tuff 凝灰岩 ; 火山凝灰岩 green tuff 绿色凝灰岩 ; 绿凝灰岩 ...
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地质学上，此石材属于火山凝灰岩。
In petrographic terms, this stone is defined as volcanic tufa.
骑马沟铅锌矿赋存于熊耳群条纹状硅质大理岩与火山凝灰岩之间。
The Qimagou Pb-Zn deposit occurs between onyx siliceous marble and volcanic tuff of the Xiong 'er Group.
本发明方法以锰渣作为轻骨料与火山凝灰岩石粉、粉煤灰和水泥混合压制成墙体砌块。
The method takes the manganese slag as the lightweight aggregate to be mixed with the volcanic tuff stone powder, the fly ash and the cement, thus producing the wall block by pressing.
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