Citation: Armbruster, T.; Gutzmer, J.; Gnos, E.; Doebelin, N.; Dixon, R.; Hejny, C.; Medenbach, O. (2002). Manganvesuvianite and tweddillite, two new Mn(3+)-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine (1969-), 66, pp. 137-150.