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N any of a class of exceptionally coarse-grained intrusive igneous rocks consisting chiefly of quartz and feldspar: often occurring as dykes among igneous rocks of finer grain 伟晶岩
Pegmatites seem to form during a late magmatic stage.
伟晶岩似乎是在较晚的岩浆阶段形成的。
The deposits occur in the old shield which is rich in dark rocks and pegmatites.
它们产于富含暗色岩和伟晶岩的古老地盾区内。
The results of this study are significant in understanding the compositions, forming mechanisms and origins of pegmatites.
此成果对了解伟晶岩物质成分、形成机制及成因研究具重要意义。
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