AM_Hemihedrite
Formula: Pb10 Zn Cr6 Si2 O32 F2
Name: Hemihedrite
Unit cell: 9.497 11.443 10.841 120.5 92.1 55.83 , V=787.24
Space group: P-1 (2)

McLean W J , Anthony J W , American Mineralogist , 55 (1970) p.1103-1114, The crystal structure of hemihedrite