Editing Magnesium (section)

=== Occurrence ===
{{Category see also|Magnesium minerals}}
{{See also|Boninite}}
Magnesium is the eighth-most-abundant element in the Earth's crust by mass and tied in seventh place with [[iron]] in [[molarity]].<ref name="Abundance">{{cite web|title=Abundance and form of the most abundant elements in Earth's continental crust|access-date=15 February 2008|url=http://www.gly.uga.edu/railsback/Fundamentals/ElementalAbundanceTableP.pdf|last=Railsback|first=L. Bruce|website=Some Fundamentals of Mineralogy and Geochemistry|archive-date=27 September 2011|archive-url=https://web.archive.org/web/20110927064201/http://www.gly.uga.edu/railsback/Fundamentals/ElementalAbundanceTableP.pdf|url-status=dead}}</ref> It is found in large deposits of [[magnesite]], [[Dolomite (mineral)|dolomite]], and other [[mineral]]s, and in mineral waters, where magnesium ion is soluble.<ref>{{Cite web |date=2013-04-30 |title=Magnesium EA65RS-T4 Alloy |url=https://www.azom.com/article.aspx?ArticleID=8683 |access-date=2024-05-04 |website=AZoM |language=en}}</ref>

Although magnesium is found in more than 60 [[mineral]]s, only [[Dolomite (mineral)|dolomite]], [[magnesite]], [[brucite]], [[carnallite]], [[talc]], and [[olivine]] are of commercial importance.<ref>{{Cite web |title=Magnesium Statistics and Information {{!}} U.S. Geological Survey |url=https://www.usgs.gov/centers/national-minerals-information-center/magnesium-statistics-and-information |access-date=2024-05-04 |website=www.usgs.gov}}</ref>

The {{chem|Mg|2+}} [[cation]] is the second-most-abundant cation in seawater (about {{frac|1|8}} the mass of sodium ions in a given sample), which makes seawater and sea salt attractive commercial sources for Mg.