Granophyre 2459003 208861417 2008-04-28T22:26:42Z Smalljim 100426 Fixing [[Wikipedia:Disambiguation pages with links|links to disambiguation pages]] using [[Project:AutoWikiBrowser|AWB]] '''Granophyre''' ({{pronEng|ˈgrænoʊfaɪr}}, from [[granite]] and ''porphyry'') is an [[igneous rock]] that contains [[quartz]] and alkali [[feldspar]] in characteristic angular intergrowths such as those in the accompanying image. [[Image:Granophyre 1.5mm .jpg|thumb|200px|Polarized light microscope image of an intergrowth of quartz and alkali feldspar in a granophyre (Muskox Intrusion), as seen in thin section (Long dimension is 1.5 mm)]] The [[Texture (crystalline)|texture]] is called '''granophyric'''. The texture can be similar to [[micrographic texture]] and to the coarser graphic intergrowths of quartz and alkali feldspar common in [[pegmatite]]. These textures document simultaneous crystallization of quartz and feldspar from a silicate melt at the [[eutectic]] point, perhaps in the presence of a water-rich phase. Granophyres typically are intrusive rocks that crystallized at shallow depths, and many have compositions similar to those of [[granite]]s. A common occurrence of granophyre is within layered igneous intrusions dominated by rocks with compositions like that of [[gabbro]]. In such occurrences, the granophyre may form as an end product of [[Fractional crystallization (geology)|fractional crystallization]] of a parent mafic [[magma]], or by melting of rocks into which the mafic magma was emplaced, or by a combination of the two processes. == See also == * [[Micrographic texture]] * [[Rock microstructure]] * [[Granite]] * [[Eutectic]] * [[solidus (chemistry)|Solidus]] [[Category:Igneous rocks]] [[Category:Petrology]] [[Category:Volcanology]] {{geology-stub}} [[nl:Granofier]]