Editing Andalusite (section)

== Occurrence ==
Andalusite is a common [[metamorphism|metamorphic]] mineral which forms under low pressure and low to high temperatures. The minerals [[kyanite]] and [[sillimanite]] are [[polymorphism (materials science)|polymorphs]] of andalusite, each occurring under different temperature-pressure regimes and are therefore rarely found together in the same rock. Because of this the three minerals are a useful tool to help identify the pressure-temperature paths of the host rock in which they are found. It is particularly associated with [[pelitic]] metamorphic rocks such as [[mica schist]].<ref name=Nesse2000>{{cite book |last1=Nesse |first1=William D. |title=Introduction to mineralogy |date=2000 |publisher=Oxford University Press |location=New York |isbn=9780195106916 |pages=314–318}}</ref>

The world's highest concentration of andalusite is found in the [[Glomel andalusite mine|Glomel mine]] in [[Côtes-d'Armor]] ([[France]]) which accounts for 25% of the global production of this mineral.<ref>{{Cite web |date=2022-09-16 |title=Glomel : la mine d'andalousite ouvre ses portes au public ce samedi |url=https://www.letelegramme.fr/cotes-d-armor/rostrenen-22110/glomel-la-mine-d-andalousite-ouvre-ses-portes-au-public-ce-samedi-327738.php |access-date=2024-11-21 |website=Le Télégramme |language=fr-FR}}</ref> [[South Africa]] possesses the largest portion of the world's known andalusite deposits.<ref>{{cite journal |last1=Overbeek |first1=P. W. |date=1 June 1989 |title=Andalusite in South Africa |url=https://journals.co.za/doi/abs/10.10520/AJA0038223X_1910 |journal=Journal of the Southern African Institute of Mining and Metallurgy |volume=89 |issue=6 |pages=157–171 |access-date=25 October 2021 |hdl=10520/AJA0038223X_1910}}</ref>