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                       BUREAU OF ECONOMIC GEOLOGY
                   The University of Texas at Austin
                          Austin, Texas 78712

                      JOHN T. LONSDALE, _Director_


                    Report of Investigations--No. 42




                            Texas Gemstones


                                   By
                          Elbert A. King, Jr.

                             February 1961

                    _Second Printing--February 1963
                     Third Printing--September 1972
                      Fourth Printing--March 1983
                      Fifth Printing--August 1991_




                                Contents


                                                                Page
  Introduction                                                     5
      Properties of gemstones                                   