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Quartz
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=== Prasiolite === {{distinguish|Praseolite}} [[Prasiolite]], also known as ''vermarine'', is a variety of quartz that is green in color.<ref name=QtzPage>{{cite web |url=http://www.quartzpage.de/prasiolite.html |title=Prasiolite |publisher=quarzpage.de |date=28 October 2009 |access-date=28 November 2010 |archive-url=https://web.archive.org/web/20110713052049/http://www.quartzpage.de/prasiolite.html |archive-date=13 July 2011 |url-status=live }}</ref> The green is caused by iron ions.<ref name="Klemme_etal_2018"/> It is a rare mineral in nature and is typically found with amethyst; most "prasiolite" is not natural β it has been artificially produced by heating of amethyst. {{citation needed span|text=Since 1950|date=April 2023}}, almost all natural prasiolite has come from a small [[Brazil]]ian mine, but it is also seen in [[Lower Silesia]] in [[Poland]]. Naturally occurring prasiolite is also found in the [[Thunder Bay]] area of [[Canada]].<ref name=QtzPage />
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