gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1977.041.317.36 Book Reviews Tektites and Their Origins (Developments in Petrology, 4) Graham A. L. 3 1977 41 317 142 143 O'Keefe J. A. Tektites and Their Origins (Developments in Petrology, 4) Amsterdam, Oxford, and New York Elsevier Sci. Publ. Co. 1976 xii+254 pp., 44 figs., 21 pls. Price Dfl. 95·00 (approx. $36·50) Copyright © 1977, The Mineralogical Society 1977