Citation: Kampf, A. R.; Steele, I. M.; Loomis, T. A. (2008). Jahnsite-(NaFeMg), a new mineral from the Tip Top mine, Custer County, South Dakota: Description and crystal structure. American Mineralogist, 93, pp. 940-945.
Formula: Fe3 H18 Mg2 Na O26 P4
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Fe6 H28 Mg4 O48 P8 (Fe3 H14 Mg2 O24 P4)
Multiplicity: 1