Editing Gneiss (section)

===Migmatite===
{{Main|Migmatite}}
Migmatite is a gneiss consisting of two or more distinct rock types, one of which has the appearance of an ordinary gneiss (the ''mesosome''), and another of which has the appearance of an [[intrusive rock]] such [[pegmatite]], [[aplite]], or granite (the ''leucosome''). The rock may also contain a ''melanosome'' of mafic rock complementary to the leucosome.{{sfn|British Geological Survey|1999|p=11}} Migmatites are often interpreted as rock that has been partially melted, with the leucosome representing the silica-rich melt, the melanosome the residual solid rock left after partial melting, and the mesosome the original rock that has not yet experienced partial melting.<ref>{{cite book |last1=Sawyer |first1=E. W. |title=Atlas of migmatites |date=2008 |publisher=NRC Research Press |location=Ottawa, Ontario |isbn=978-0660197876}}</ref>