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pegmatite

(peg′mə tīt′)

noun

a light-colored, coarsegrained, intrusive igneous rock, usually granitic, containing large crystals of quartz, feldspar, and mica, and sometimes rare minerals: typically found in fissures of other igneous rocks

Origin: < Gr pēgma (gen. pēgmatos), a framework, something fastened together (< IE base *paĝ-: see fang) + -ite: from its texture

Related Forms:

pegmatitic adjective

See pegmatite in American Heritage Dictionary 4

noun

A coarse-grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum.

Origin:

Origin: Greek pēgma, pēgmat-, something fastened together (from pēgnunai, to fasten; see pag- in Indo-European roots)

Origin: + -ite¹

Related Forms:

pegˌma·titˈic (-tĭtˈĭk) adjective

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