Montmorillonite forms when basic rocks such as volcanic ash in Marine basins are altered.
海相盆地中的基性岩石(如火山灰)经蚀变后形成蒙脱石。
The development of the fractures and the distribution of basic rocks of Variscan age are also mentioned.
指出了该区断裂发育及华力西期基性岩的分布情况。
Pyroxene is ultrabasic rocks and basic rocks in the main mineral, also in the andesite often appear as phenocrysts.
辉石为超基性岩和基性岩中最主要的矿物，另外在安山岩中常以斑晶出现。
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