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An Overview of Production of Specific U.S. Gemstones

U.S. Bureau of Mines Special Publication 14-95

California Tourmaline - Click to view Contents page
California Tourmaline
(Photo courtesy of Smithsonian Institution)

contents navigation bar chalcedony specialty feldspar garnet opal pearls

contents navigation bar peridot quartz sapphires synthetic tourmaline turquoise

Contact:  Donald W. Olson (

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