Hematite(Fe2O3) is a common member of the corundum group and is usually found in sedimentary of metamorphosed sedimentary rocks. When present in metamorphic or igneous rocks, it is indicative of highly oxidizing conditions. The red color of hematite is very intense because the Fe(+3)O6 octahedra are somewhat asymmetric, intensifying the bands in the hematite spectrum.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
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