AM_Joesmithite
Formula: (Pb.928 K.072) Mg2.551 Fe2.449 (Ca1.9 Na.1) Si6.306 Be1.694 O24
Name: Joesmithite
Unit cell: 9.915 17.951 5.243 90.0 105.95 90.0 , V=897.25
Space group: P12/A1 (13)

Moore P B , Davis A M , Van Derveer D G , Sen Gutpa P K , Mineralogy and Petrology , 48 (1993) p.97-113, Joesmithite, a plumbous amphibole revisited and comments on bond valences