Citation: Sueno, S.; Papike, J. J.; Prewitt, C. T.; Brown, G. E. (1972). Crystal structure of High Cummingtonite. Journal of Geophysical Research, 77, pp. 5767-5777.
Formula: Al0.01 Ca0.36 Fe0.01 H2 Mg5.57 Mn0.96 Na0.06 O24 Si8.02
Chemical name: (Na.06 Ca.36 Mn.96 Fe.01 Mg5.57 Al.01) Si8.02 O22 (O H)2
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al4 Ca4 Fe4 Mg14 Mn4 Na4 O48 Si16 (Al2 Ca2 Fe2 Mg7 Mn2 Na2 O24 Si8)
Multiplicity: 1