The magnetic susceptibility, chi, has been measured between 1.5 and 30
0K for three high quality icosahedral quasicrystals of Al-Cu-Fe with e
lectrical resistivities in the range 4.5-10 mOMEGA-cm. After correctio
n for the important contribution from minute amounts of Fe clusters, t
he magnetic susceptibility is found to be diamagnetic for all samples
and temperatures.