AM_Gudmundite
Formula: Fe Sb S
Name: Gudmundite
Unit cell: 6.02 5.93 6.02 90.0 67.87 90.0 , V=199.07
Space group: P121/C1 (14)

Buerger M J , American Mineralogist , 24 (1939) p.183-184, The crystal structure of gudmundite