火成岩
1. 岩浆岩：pyrochlore 烧绿石 | pyrogenic rock 岩浆岩 | pyrolusite 软锰矿
2. 火成岩：pyrogenetic rock 火成岩 | pyrogenic rock 火成岩 | pyrogenous 火成的
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1. Of or relating to rock so formed; pyrogenic.
火成岩的，熔灰岩的按上述方法形成的岩石的，与之有关的；火成的
2. In the closed seam, the pyrogenic rock compressed and compacted the structure coal. There is a stress concentrated at the tip of the structure, which could provide the inner energy for the gas.
火成岩对煤层挤压揉皱形成构造煤，同时构造尖灭端应力集中，提供了足够的瓦斯热力学能。