Columbite-(Mn)
Toumi coltan diggings, Ouèssè Commune, Collines Department, Benin
Coarse, eluvial columbite-(Mn) found in one of the numerous eluvial diggings at Toumi. The columbite is quite rich in Ta2O5 and very poor in uranium and thorium. The columbite-(Mn) is XRD and SEM-EDS confirmed. Photo by Wolfgang Hampel
© Wolfgang Hampel