AM_Penninite
Formula: Mg4.9 Fe.3 Al1.64 Si3.16 O17.98 H7.86
Name: Penninite
Unit cell: 5.3266 9.232 14.399 90.0 97.16 90.0 , V=702.55
Space group: C1-11 (1)

Joswig W , Fuess H , Rothbauer R , Takeuchi Y , Mason S A , American Mineralogist , 65 (1980) p.349-352, A neutron diffraction study of a one-layer triclinic chlorite (penninite)