Citation: Grew, E. S.; Armbruster, T.; Lazic, P.; Yates, M. G.; Medenbach, O.; Huijsmans, J. P. P. (2011). Werdingite from a pegmatite at Almgjotheii, Rogaland, Norway: The role of iron in a borosilicate with a mullite-type structure. European Journal of Mineralogy, 23, pp. 577-589.