GEMSTONES
California Tourmaline (Photo courtesy of Smithsonian Institution) |
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U.S. Department of the Interior U.S. Geological Survey Minerals Information 988 National Center Reston, VA 20192 USA URL: http://minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/index.html Maintained by: rcallaghan@usgs.gov Last modification: 11-Jan-2013@16:55 Privacy Statement || Disclaimer || FOIA || Accessibility |