Formula: Mg1.08 Al.82 Fe.12 K.02 Si3.96 O15.5 D5 H1.8
Name: Palygorskite
Unit cell: 13.337 17.879 5.264 90.0 105.27 90.0 , V=1210.90
Space group: C12/M1 (12)

Guistetto R , Chiari G , European Journal of Mineralogy , 16 (2004) p.521-532, Crystal structure refinement of palygorskite from neutron powder diffraction, Locality: Lorenzo Pech mine, near Ticul, on the way to Chapab, Chiapas, Mexico, Note: Occupancies created to match reported formula