Abstract

The ores have a rather uniform titania content, averaging 0.77 percent. Titanium occurs mainly in solid solution in hematite (0.15 to 8 percent) with lesser amounts as ilmenite, anatase, rutile, sphene, leucoxene, and biotite. Magnetite contains 0.1-0.2 percent. High-grade hematite ores generally have all titania in the hematite. Ilmenite and finally anatase increase in abundance as grade decreases, and also as the magnetite-hematite ratio increases at the boundaries between hematite and magnetite ore. Textures suggest that uniformly distributed titania in the host-rock was preferentially taken up by hematite, and that greatest subsequent exsolution took place in those rocks with least hematite.

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