Citation: MacDonald, D. J.; Hawthorne, F. C.; Grice, J. D. (1993). Foitite, _[Fe2(Al,Fe)]Al6Si6O18(BO3)3(OH)4, a new alkali-deficient tourmaline: Description and crystal structure. American Mineralogist, 78, pp. 1299-1303.
Formula: Al6.891 B3 Fe1.599 Li0.219 Mg0.051 Mn0.24 Na0.25 O31 Si6
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al27 B9 Fe27 Li9 Mg9 Mn9 O93 Si18 (Al9 B3 Fe9 Li3 Mg3 Mn3 O31 Si6)
Multiplicity: 1