calcrete uranium In arid climates prolonged evaporation may cause hard surface crusts to form; if CaCO₃ predominates the crust is called caliche (calcrete). Where the bedrock contains high levels of uranium the calcrete is locally uraniferous and may constitute a workable ore, e.g. in western Australia and Namibia.

calcrete uranium A calcrete (caliche) that is locally uraniferous and may constitute a workable ore (e.g. in western Australia and Namibia) because it has formed over a bedrock containing a high concentration of uranium.