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== Enllaços externs ==
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* [http://www.geolab.unc.edu/Petunia/IgMetAtlas/mainmenu.html Atlas of Igneous and metamorphic rocks, minerals, and textures] {{Webarchive|url=https://web.archive.org/web/20061208034044/http://www.geolab.unc.edu/Petunia/IgMetAtlas/mainmenu.html |date=2006-12-08 }} - Geology Department, [[University of North Carolina]]
* [http://metpetdb.rpi.edu Metamorphic Petrology Database ([[MetPetDB]])] - Department of Earth and Environmental Sciences, [[Rensselaer Polytechnic Institute]]
* [http://www.petdb.org/ Petrological Database of the Ocean Floor (PetDB)] - Center for International Earth Science Information Network (CIESIN), [[Columbia University]]
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