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The compounds Mn 2 Al 4 Si 5 O 18 , Fe 2 Al 4 Si 5 O 18  and Mg 2 Al 4 Si 5 O 18  were prepared hydrothermally. Complete miscibility is possible between Mn- and Fe-cordierite, as well as between Fe and Mg cordierite; Mn and Mg cordierite however show a very limited miscibility. The presumed miscibility gap is given. Ca is only slightly incorporated in cordierite. Mn-cordierite formed at low reaction temperatures shows an incorporation of (OH) similar to that in the hydrogarnets. The structure determined by B yström  is verified, though in addition an appreciable electron density was found in the channels. The lack of a Mn cordierite in nature is discussed.

zeitschrift für kristallographie

Mischbarkeit und strukturelle Eigenschaften von synthetischem Cordierit in den Systemen (MnO, FeO, MgO, CaO)–Al 2 O 3 –SiO 2 –H 2 O bei verhältnismäßig niedrigen Temperaturen und Drucken