Abstract: This dataset is a compilation of laboratory ultrasonic measurements for seismic velocity of different natural rocks. The goal of this compilation is to compare laboratory measured seismic velocities with in situ geophysical observations, and to link seismic velocities with chemical composition. Rock type, density, SiO2 content and some mineralogy information of samples are also included. Other Description: Babuska, V. (1972), ELASTICITY AND ANISOTROPY OF DUNITE AND BRONZITITE, Journal of Geophysical Research, 77(35), 6955-6965. Barruol, G., and H. Kern (1996), Seismic anisotropy and shear-wave splitting in lower-crustal and upper-mantle rocks from the Ivrea Zone - Experimental and calculated data, Physics of the Earth and Planetary Interiors, 95(3-4), 175-194. Birch, F. (1960), THE VELOCITY OF COMPRESSIONAL WAVES IN ROCKS TO 10-KILOBARS .1, Journal of Geophysical Research, 65(4), 1083-1102. Birch, F. 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