Recent experimental results on impact destruction of rocks (basalt and tuff) are summarized. The mode of destruction and some empirical relations between the mass of the largest fragment M1, the released kinetic energy divided by target mass Ei, and the work done during impact W are presented. The mass M1 can be related to both Ei and W:log (M1/M1)= a-βlog Ei and log (M1/M1)=b-&ggr;log W. An effect due to the difference in impact velocity on the M1 versus Ei relation can be observed, but there seems to be no effect due to impact velocity oon the M1 versus W relation. Thus it may be suggested that W is a useful means of describing phenomena associated with the impact destruction of rocks. Target shape also affects the M1 versus Ei relation but no large differences have been observed between various rocks. The size distribution of fragments can be adequately expressed in terms of an inverse power law relation, in which slope of the size distribution α (i.e., exponent) increases with increasing Ei;α=0.90+0.36 log Ei for basalt and α=1.94+0.24 log Ei for tuff. Based on the empirical α-Ei relations, a fragmentation model of the parent bodies of Eos and Koronis families is presented. It is suggested that the parent bodies of Eos and Koronis families had been differentiated prior to fragmentation and were completely fragmented at Ei=~2¿104 joule/kg and ~2¿103 joule/kg.