Ilmenite (FeTiO3) is extremely common in both igneous and metamorphic rocks, where it's presence often serves as a signature of high activity of TiO2 saturation and/or relatively reducing conditions. Ilmenite typically contains some magnetite (Fe2O3) in solid solution and in favorable conditions can help indicate both temperature and redox conditions under which it formed.
Ilmenite is antiferromagnetic.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
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