CRYSTAL STRUCTURE OF GARNET (MN3)[FE2](GE3)O12

The crystal structure of the garnet {Mn3}[Fe2](Ge3)Oi2 has been refined by least-squares calculations applied to single-crystal data collected with a Buerger-Supper-Pace-Picker automatic diffractometer. The Ge-O distance is 1.77 ± 0.02 Â (limits of error), about 0.03 Å longer than the Ge-O distance in quartz-type Ge02. This is in accord with the analogous Si-O distances. The Fe-O distance is 2.00 ± 0.02 Â in good agreement with the analogous distance in three iron garnets. The Mn-O distances are 2.30 and 2.42 ± 0.02Â. The structural results are in accord with the absence of ferrimagnetism in the {Mn3}[Fe2](Ge3)Oi2 garnet. © 1969, Walter de Gruyter. All rights reserved.