pegmatitic


peg·ma·tite

P0152600 (pĕg′mə-tīt′)n. A coarse-grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum.
[Greek pēgma, pēgmat-, something fastened together (from pēgnunai, to fasten; see pag- in Indo-European roots) + -ite.]
peg′ma·tit′ic (-tĭt′ĭk) adj.