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TeachMeFinance.com - explain Pegmatite Pegmatite The term 'Pegmatite' as it applies to the area of volcanos can be defined as '　　 An igneous rock with very large (usually > one inch), well-formed crystals. A granitic pegmatite has the mineralogy of a granite and abnormally large grains, whereas a gabbroic pegmatite has the mineralogy of a gabbro and very large grains. An intrusive igneous rock'. The term 'Pegmatite' as it applies to the area of reclamation can be defined as ' Very coarse-grained intrusive igneous rock of granitic composition that typically fills fractures to form veins'. Previous 5 Terms: Pedigree pedological pedology pedometer peer review Next 5 Terms: peirameter pelargic Pelean eruption pelecoid Pellet, fuel About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.