a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
例句
用作名词(n.)
As with other mines containing pegmatite rocks, Brazilian Alexandrite is found in rugged areas that can be difficult to access.如其它含有伟晶岩的矿藏一样，巴西亚历山大石也只能在难以到达的崎岖地区所发现。
Li- Be-Ta-Nb-bearing deposits in Lianyun Mountain occurred in Shangshi on the south wing of Lianyun Mountain anticline, the densely distributed pegmatite area.连云山上石含锂铍钽铌矿床位于连云山背斜南翼上石伟晶岩密集区，其地层为板溪群二云母片岩。
