Natural Gemstones

Natural Gemstones

By Various
Book Description
Table of Contents
  • Natural Gemstones
  • Natural gemstones
    • Geologic environment
    • Gemstones occur in most major geologic environments.
    • Mineral gemstones
    • Birthstones
    • Organic gemstones
    • Buyer beware
    • Since 1935, the mining of gemstones in the United States has been almost entirely a recreational activity of mineral collectors and hobbyists.
    • The 1990 U.S. output of natural gemstones was primarily from Tennessee, California, Arizona, Arkansas, Montana, Nevada, and Maine.
    • Gemstones: Value of U.S. production vs. imports, 1986 and 1989[1]
    • Except for the few gem diamonds found each year in Arkansas, U.S. diamond production is very low.
    • World diamond reserves are estimated to be about 300 million carats, including near-gem materials but not diamonds of abrasive quality.
    • Chemical formulas of gemstones
    • Some ways to contact a local rock, mineral, or gem club
    • Role of the U.S. Geological Survey (USGS)
    • Selected general references
    • Acknowledgments
    • Photographs
  • Transcriber’s Notes
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