“…Against facts observed under oxidant conditions, where boltwoodite is the secondary phase observed [5], characterization by X-ray diffraction ( Figure 2) showed a low crystallinity solid mainly composed of schoepite and sodium uranate. Low crystallinity is due to a non-pure system, i.e., to the groundwater, a chemical composition of Sr, Ba, Mo, Y, La, Nd, Ru, Rd, Pd, and U, must be added.…”