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For more information, contact R.W. Cahn, University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge, CB2 3QZ, Great Britain; e-mail rwc12@cam.ac.uk.
Editor’s Note: The following commodities report is taken from Mineral Commodity Summaries 2000, an annual report published by the U.S. Department of Interior, U.S. Geological Survey. Copies of the report are available on the Internet at minerals.usgs.gov/minerals/pubs/mcs or through the U.S. Government Printing Office, Superintendent of Documents, P.O. Box 371954, Pittsburgh, Pennsylvania 15250-7954;...
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