Abstract
The stable polymorphs of MnGeO3 are orthopyroxene type (Phase I), clinopyroxenetype (II), ilmenite type (III) and perovskite type (IV) in the order of pressureincrease. The crystallographic data and crystal structures of the polymorphs aredescribed except for the perovskite type, the structure of which has not been accuratelydetermined. These structures areE compared with the structures of similargermanates and silicates of different metals rather than Mn and the characteristicsof the ilmenite type (III) of MnGeO3 are discussed.
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