Citation: Joswig, W.; Fuess, H.; Rothbauer, R.; Takeuchi, Y.; Mason, S. A. (1980). A neutron diffraction study of a one-layer triclinic chlorite (penninite). American Mineralogist, 65, pp. 349-352.
Formula: Al1.64 Fe0.3 H7.86 Mg4.9 O17.98 Si3.16
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al14 Fe6 H4 Mg6 O24 Si8 (Al7 Fe3 H2 Mg3 O12 Si4)
Multiplicity: 1
Formula: Al6 H12 Mg6 O12 (Al H2 Mg O2)