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Extensive negative aeromagnetic anomalies in the Modum area, south Norway, derive from rocks containing ilmenite with hematite exsolution, or hematite with ilmenite exsolution, carrying strong/stable reversed remanence. Here we describe a 2.5 cm thick high-temperature metamorphic vein of exsolved titanohematite. Reflected-light and EMP analyses show it contains three types of exsolution: spinel plates on (001); rutile blade satellites on spinel oriented at angles of ~60-90° to titanohematite (001); and lamellae 0.1-0.3 mm thick too fine for EMP analyses, also parallel to (001). Powder XRD gave a = 5.0393 Å, c = 13.7687 Å, V = 302.81 Å 3  for titanohematite (≈Ilm9), and unrefined reflections of rutile and geikielite. Overlap EMP analyses showed enrichment in MgO, TiO 2 , and lack of Al 2 O 3 , indicating a mixture of titanohematite and geikielite. Non-overlap analyses showed the titanohematite is 6%Fe2+TiO 3 , 2%MgTiO 3 , 92% Fe 2 O 3 , generally confirmed by TEM-EDX analyses that also showed the geikielite is 30%Fe 2+ TiO 3 , 70%MgTiO 3 .

Ferroan geikielite and coupled spinel-rutile exsolution from titanohematite: Interface characterization and magnetic properties