Harvey E. Belkin, Geologist, Geological Survey, U.S. Department of the Interior, Reston, VA.
Gordon T. Austin, "Gemstones," Mineral Commodity Summaries 1991, Bureau of Mines, U.S. Department of the Interior, Washington, DC.
Robert E. Thaden, "Gem Stones," in United States Mineral Resources, Geological Survey Professional Paper 820, U.S. Government Printing Office, Washington, 1973, p. 247-250.
Jane Jenness, Minerals Information Office, U.S. Geological Survey, Washington, DC.
The original "Natural Gemstones" publication is one of a series of general interest publications prepared by the U.S. Geological Survey to provide information about the earth sciences, natural resources, and the environment. To obtain a catalog of additional titles in the series "General Interest Publications of the U.S. Geological Survey," write:
As the Nation's principal conservation agency, the Department of the Interior has responsibility for most of our nationally owned public lands and natural resources. This includes fostering the wisest use of our land and water resources, protecting our fish and wildlife, preserving the environmental and cultural values of our national parks and historical places, and providing for the enjoyment of life through outdoor recreation. The Department assesses our energy and mineral resources and works to assure that their development is in the best interests of all our people. The Department also has a major responsibility for American Indian reservation communities and for people who live in Island Territories under U.S. administration.
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