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Date: 2005-10-27 02:31:12Gemstones Superhard materials Abrasives Nesosilicates Oxide minerals Rutile Corundum Pleochroism Ruby Chemistry Crystallography Matter | Corundum Al2 O3Add to Reading ListSource URL: rruff.infoDownload Document from Source WebsiteFile Size: 70,87 KBShare Document on Facebook |