Editing Granitoid (section)

{{Short description|Category of coarse-grained igneous rocks}}
[[File:Granite.jpg|thumb|Granite rock hand-sized sample]]

A '''granitoid''' is a broad term referring to a diverse group of coarse-grained igneous rocks that are widely distributed across the globe, covering a significant portion of the Earth's exposed surface and constituting a large part of the continental crust.<ref>{{Cite journal |last=Tomás |first=R. |last2=Cano |first2=M. |last3=Pulgarín |first3=L. F. |last4=Brotóns |first4=V. |last5=Benavente |first5=D. |last6=Miranda |first6=T. |last7=Vasconcelos |first7=G. |date=2021-11-01 |title=Thermal effect of high temperatures on the physical and mechanical properties of a granite used in UNESCO World Heritage sites in north Portugal |url=https://linkinghub.elsevier.com/retrieve/pii/S2352710221006811 |journal=Journal of Building Engineering |volume=43 |pages=102823 |doi=10.1016/j.jobe.2021.102823 |issn=2352-7102|hdl=10045/115630 |hdl-access=free }}</ref> These rocks are primarily composed of [[quartz]], [[plagioclase]], and [[alkali feldspar]].<ref>{{cite web | url=https://mrdata.usgs.gov/catalog/science.php?thcode=4&term=4.4 | title=USGS: Mineral Resources On-Line Spatial Data: Granitoid }}</ref> Granitoids range from plagioclase-rich [[tonalite]]s to alkali-rich [[syenite]]s and from quartz-poor [[monzonite]]s to quartz-rich [[quartzolite]]s.<ref name="Streckeisen-1974">{{cite journal |last=Streckeisen |first=A. |year=1974 |title=Classification and Nomenclature of Plutonic Rocks: Recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks |journal=Geologische Rundschau |volume=63 |issue=2 |pages=773–86 |bibcode=1974GeoRu..63..773S |doi=10.1007/BF01820841 |s2cid=130569261 |language=de}}</ref> As only two of the three defining mineral groups (quartz, plagioclase, and alkali feldspar) need to be present for the rock to be called a granitoid, [[feldspathoid|foid]]-bearing rocks, which predominantly contain feldspars but no quartz, are also granitoids.<ref name="Streckeisen-1974" />