LiZn2Mo3O8 is a highly unusual geometrically frustrated material: the magnetic moments are associated not with single ions but with small transition-metal clusters. The spin is delocalized over the three crystallographically equivalent Mo ions in a Mo3O12 cluster. Below 96 K there is a sudden change in the slope of the inverse magnetic susceptibility and the behaviour below that is consistent with two-thirds of the spins condensing into a valence bond state. This experiment is designed to search for magnetic order or spin freezing in the remaining one-third of spins in order to explain the behaviour of the heat capacity. Neutron measurements have failed to observe long range magnetic order but are not sensitive to weak moments.