AM_Bartonite
Formula: K1.893 Fe6.789 S8.975
Name: Bartonite
Unit cell: 10.424 10.424 20.626 90.0 90.0 90.0 , V=2241.22
Space group: I4/MMM (139)

Evans H T , Clark J R , American Mineralogist , 66 (1981) p.376-384, The crystal structure of bartonite, a potassium iron sulfide, and its, relationship to pentlandite and djerfisherite