Editing Amphibole (section)

===In rocks===
[[File:Mineralogy igneous rocks EN.svg|thumb|upright=1.4|Mineral assemblage of igneous rocks]]
[[File:Horndio.jpg|thumb|Hornblende diorite from the Henry Mountains, Utah, US]]
[[File:Amphibolite (Precambrian; Warrensburg, Adirondack Mountains, New York State, USA) 1.jpg|thumb|Amphibolite from Warrensburg, Adirondack Mountains, New York State, USA]]
Amphiboles are minerals of either [[igneous rock|igneous]] or [[metamorphism|metamorphic]] origin. Amphiboles are more common in [[intermediate rock|intermediate]] to [[felsic]] igneous rocks than in [[mafic]] igneous rocks,<ref>{{Cite journal|last1=Peters|first1=Stefan T. M.|last2=Troll|first2=Valentin R.|last3=Weis|first3=Franz A.|last4=Dallai|first4=Luigi|last5=Chadwick|first5=Jane P.|last6=Schulz|first6=Bernhard|date=2017-03-16|title=Amphibole megacrysts as a probe into the deep plumbing system of Merapi volcano, Central Java, Indonesia|url=https://doi.org/10.1007/s00410-017-1338-0|journal=Contributions to Mineralogy and Petrology|language=en|volume=172|issue=4|pages=16|doi=10.1007/s00410-017-1338-0|bibcode=2017CoMP..172...16P|s2cid=132014026|issn=1432-0967}}</ref> because the higher [[silica]] and dissolved water content of the more [[igneous differentiation|evolved]] magmas favors formation of amphiboles rather than pyroxenes.{{sfn|Nesse|2000|p=279–280}}  The highest amphibole content, around 20%, is found in [[andesite]]s.<ref>{{cite book |last1=Levin |first1=Harold L. |title=The earth through time |date=2010 |publisher=J. Wiley |location=Hoboken, N.J. |isbn=978-0470387740 |page=62 |edition=9th}}</ref> [[Hornblende]] is widespread in igneous and metamorphic rocks and is particularly common in [[syenite]]s and [[diorite]]s. Calcium is sometimes a constituent of naturally occurring amphiboles. Amphiboles of metamorphic origin include those developed in [[limestone]]s by contact metamorphism ([[tremolite]]) and those formed by the alteration of other ferromagnesian minerals (such as hornblende as an alteration product of pyroxene).{{sfn|Klein|Hurlbut|1993|p=496-497}} [[Pseudomorph]]s of amphibole after pyroxene are known as [[uralite]].{{sfn|Nesse|2000|p=285}}