silicified tuff

例句：

1. 1. The ancient volcano erupted, leaving behind a layer of silicified tuff as evidence of its past activity.
   古老的火山爆发了，留下了一层硅化凝灰岩作为其过去活动的证据。
2. 2. The geological survey team found that the silicified tuff was formed by the reaction between magma and the surrounding rocks.
   地质调查队发现，硅化凝灰岩是由岩浆与周围岩石反应形成的。
3. 3. The mineralogist analyzed the chemical composition of the silicified tuff anddetermined its potential for use in building materials.
   矿物学家分析了硅化凝灰岩的化学成分，并确定了其在建筑材料中的潜在用途。