Natural Gemstones
by Geological Survey
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Language: English
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About this eBook
- Author
- Geological Survey (U.S.)
- Credits
- Produced by Stephen Hutcheson, Dave Morgan, Carol Spears and the Online Distributed Proofreading Team at www.pgdp.net
- Language
- English
- LoC Class
- QE: Science: Geology
- Subject
- Gems -- United States
- Category
- Text
- eBook-No.
- 47999
- Project Gutenberg
- https://www.gutenberg.org/ebooks/47999
- Release Date
- January 16, 2015
- Copyright
- Public domain in the USA.
Contents
- 1.Natural Gemstones
- 2.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
- 3.Transcriber’s Notes
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