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Fixed some typos and incorrect statements (e.g. olivine is not necessary in a norite; the pyroxene composition is more variable than the text implied; Pt mineralization is not that common in magic layered intrusions).
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m Open access bot: doi added to citation with #oabot.
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Norite occurs with gabbro and other mafic to [[ultramafic]] rocks in [[layered intrusion]]s which are often associated with [[platinum]] [[ore]]bodies such as in the Bushveld Igneous Complex in [[South Africa]], the [[Skaergaard intrusion|Skaergaard igneous complex]] of [[Greenland]], and the [[Stillwater igneous complex]] in [[Montana]]. Norite is also the basal igneous rock of the [[Sudbury Basin]] complex in [[Ontario]], which is the site of a [[impact event|comet impact]] and the world's second-largest [[nickel]] mining region.
<ref>{{citation| last=Petrus| first = Joseph A.|last2= Ames | first2= Doreen E. | last3 = Kamber |first3= Balz S.| journal= Terra Nova| date= October 18, 2014| doi= 10.1111/ter.12125| title=On the track of the elusive sudbury impact: geochemical evidence for a chondrite or comet bolide (accepted for publication)| doi-access= free}}</ref> <ref>{{cite web|url = http://www.largeigneousprovinces.org/sites/default/files/BushveldLIP.pdf|title=The Bushveld Large Igneous Province |publisher = School of Geosciences, University of the Witwatersrand |author= Judith A.Kinnaird |accessdate= March 1, 2018}}</ref>
<ref>{{cite web|url = https://academic.oup.com/petrology/article/45/3/507/1396172 |title= The Shape and Volume of the Skaergaard Intrusion, Greenland: Implications for Mass Balance and Bulk Composition
|publisher = Journal of Petrology, Volume 45, Issue 3, 1 March 2004, Pages 507–530|author= Troels F. D. Nielsen|accessdate= March 1, 2018}}</ref><ref>{{cite web|url = http://www.d.umn.edu/~mille066/Teaching/5100/Articles/McCallum.Stillwater.pdf|title= The Stillwater Complex: A review of the geology|publisher = University of Washington|author= I. S. McCallum|accessdate= March 1, 2018}}</ref>
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