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WikiPedia: Tinh_hốc http://www.amonline.net.au/factsheets/geodes.htm //books.google.com/books?id=haCztne87E4C&pg=PA67 //books.google.com/books?id=r_2Ia8wOBlgC&pg=PA221 http://www.rocksforkids.com/R&M/geodes.html http://www.igsb.uiowa.edu/browse/geodes/geodes.htm http://www.isgs.uiuc.edu/maps-data-pub/publication... http://www.uky.edu/KGS/rocksmn/geodes.htm http://geology.utah.gov/utahgeo/rockmineral/collec... https://web.archive.org/web/20070613161818/http://... https://web.archive.org/web/20070927100407/http://...