Citation: Armbruster, T.; Gnos, E.; Dixon, R.; Gutzmer, J.; Hejny, C.; Dobelin, N.; Medenbach, O. (2002). Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine, 66, pp. 137-150.