Editing Peridotite (section)

==Economic geology==
Peridotite may potentially be used in a low-cost, safe and permanent method of capturing and storing atmospheric CO<sub>2</sub> as part of [[global warming|climate change]]-related [[Carbon capture and storage|greenhouse gas sequestration]].<ref>{{cite news|title=Rocks Could Be Harnessed To Sponge Vast Amounts Of Carbon Dioxide From Air|work=Science Daily|date=November 6, 2008|url=https://www.sciencedaily.com/releases/2008/11/081105180813.htm |access-date=24 February 2022}}</ref> It was already known that peridotite reacts with CO<sub>2</sub> to form a solid [[Carbonate rock|carbonate]]-like limestone or marble mineral; and this process can be sped up a million times or more by simple [[drilling]] and [[hydraulic fracturing]] to allow injection of the CO<sub>2</sub> into the subsurface peridotite formation.<ref>{{cite journal |last1=Kelemen |first1=P. B. |last2=Matter |first2=J. |title=In situ carbonation of peridotite for CO<sub>2</sub> storage |journal=Proceedings of the National Academy of Sciences |date=2008 |volume=105 |issue=45 |pages=17295–17300 | pmc=2582290 |doi=10.1073/pnas.0805794105|doi-access=free }}</ref>

Peridotite is named for the [[gemstone]] [[peridot]], a glassy green gem originally mined on [[Zabargad Island|St. John's Island in the Red Sea]]<ref>[http://www.mindat.org/loc-6423.html St. John's Island peridot information and history] at [[Mindat.org]]</ref> and now mined on the [[San Carlos Apache Indian Reservation]] in Arizona.<ref>{{cite book |quote="Although some good olive-colored crystals are found in a few other places, like Burma, China, Zambia, and Pakistan, ninety percent of all known peridots are found in just one place. It is a Native American reservation, and it is located in a little-visited corner of the United States. San Carlos" |last1=Finlay |first1=Victoria |title=Jewels: A Secret History |pages= 2543–2546 |publisher=Random House Publishing Group |edition=Kindle}}</ref>

Peridotite that has been hydrated at low temperatures is the protolith for [[serpentinite]], which may include chrysotile asbestos (a form of serpentine){{sfn|Nesse|2000|pp=241–242}} and [[talc]].{{sfn|Nesse|2000|pp=242–243}}

Layered intrusions with cumulate peridotite are typically associated with sulfide or chromite ores. Sulfides associated with peridotites form nickel ores and platinoid metals; most of the [[platinum]] used in the world today is mined from the [[Bushveld Igneous Complex]] in [[South Africa]] and the [[Great Dyke]] of [[Zimbabwe]].{{sfn|Nesse|2000|pp=387–388}} The chromite bands found in peridotites are the world's major source of [[chromium]].{{sfn|Nesse|2000|pp=361–362}}