Citation: Foit, F. F. (1989). Crystal chemistry of alkali-deficient schorl and tourmaline structural relationships. American Mineralogist, 74, pp. 422-431.
Formula: Al6.966 B3 Fe1.902 H3 Na0.54 O30.333 Si5.856
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al45 B9 Fe9 H9 O93 Si18 (Al15 B3 Fe3 H3 O31 Si6)
Multiplicity: 1