向熔岩过渡的火山碎屑岩主要为角砾熔岩和凝灰熔岩等。
The pyroclastic rocks which transit to lava mainly have breccia lava and tuff lava etc.
此外，高火山灰性(凝硬性)灰可以通过控制燃烧来产生，此时，二氧化硅保持在非结晶形式和蜂窝状结构。
In addition, highly pozzolanic ash can be produced by means of controlled combustion, when silica is kept in non-crystalline form and cellular structure.
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