SELECTED REFERENCES

Anderson, B. W. (1948) Gem testing: Emerson, New York.

Baker, C. L. (1935) Metallic and non-metallic minerals and ores

(precious stones), _in_ The geology of Texas, Vol. II, Structural and

economic geology: Univ. Texas Bull. 3401, Jan. 1, 1934, pp. 568-569.

Barnes, V. E. (1940) North American tektites: Univ. Texas Pub. 3945,

Dec. 1, 1939, pp. 477-582.

Dake, H. C., Fleener, F. L., and Wilson, B. H. (1938) Quartz family

minerals: Whittlesey House, McGraw-Hill Book Company, Inc., New York.

Ford, W. E. (1932) A textbook of mineralogy (4th ed.): John Wiley and

Sons, Inc., New York.

Kraus, E. H., and Slawson, C. B. (1947) Gems and gem materials (5th

ed.): McGraw-Hill Book Company, Inc., New York.

Kunz, G. F. (1892) Gems and precious stones of North America (2d ed.):

Scientific Publishing Company, New York.

Pough, F. H. (1953) A field guide to rocks and minerals: Houghton

Mifflin Company, Boston.

Simpson, B. W. (1958) Gem trails of Texas: Granbury, Texas.

Sinkankas, John (1955) Gem cutting: D. Van Nostrand Company, Inc.,

Princeton, New Jersey.

—— (1959) Gemstones of North America: D. Van Nostrand Company, Inc.,

Princeton, New Jersey.

Smith, G. F. H. (1958) Gemstones (13th ed.), revised by F. C. Phillips:

Methuen and Company, Ltd., London.

Sperisen, F. J. (1950) The art of the lapidary: The Bruce Publishing

Company, Milwaukee, Wisconsin.

Sterrett, D. B. (1913) Gems and precious stones, _in_ Mineral resources

of the United States, Calendar Year 1912, Part II, Non-metals: U. S.

Geol. Survey, pp. 1023-1060.

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