In this study we focus on the precipitation of betagenic elements (Fe, Cr, Ni) that occurs during the β→α allotropic transition in zirconium. In particular its structural characteristics, morphology and their consequences for the mechanical behaviour of the material are probed. The observations are made by means of a scanning electron microscope and a transmission electron microscope. The results reveal the occurrence of a quasi-continuous single crystalline phase, produced by the precipitation of the betagenic additional elements which constitute the so-called lath boundaries. This phase forms a layer surrounding the laths in the bulk of the material. Its morphology could be assimilated to a net, created by precipitates with a size of several micrometres and linked by narrow bridges with a size of several hundred nanometres. The chemical composition of the precipitates are of the Zrx(Cr,Fe2)1-x type with x≤40%.