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Feb 16, 2012
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Encyclopediagem, ornamental mineral or organic substance

Bibliography

See J. Sinkankas, Gemstones of North America (1959); F. J. Sperisen, The Art of the Lapidary (rev. ed. 1961); R. Webster, Gems (2d ed. 1970); J. D. Dana, Manual of Mineralogy (18th ed., rev. by C. S. Hurlbut, Jr., 1971).

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

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