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pegmatite
peg·ma·tite [ pégmə tt ] (plural peg·ma·tites)


noun 
Definition:
 
coarse-grained igneous rock: a coarse-grained igneous rock, usually granite, that is characterized by large well-formed crystals and often contains rare elements
[Mid-19th century. < Greek pēgmat- "something joined together"]

peg·ma·tit·ic [ pègmə títtik ] adjective
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