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Date: 2007-09-30 01:00:36Gemstones Superhard materials Abrasives Nesosilicates Oxide minerals Rutile Corundum Pleochroism Ruby Chemistry Crystallography Matter | Corundum Al2 O3Add to Reading ListSource URL: www.handbookofmineralogy.orgDownload Document from Source WebsiteFile Size: 70,87 KBShare Document on Facebook |