Properties and Composition It is a weakly magnetic titanium-iron oxide mineral with the formula FeTiO3. It is a dense, black, non-metallic solid. Chemically, it is an iron(II) titanium oxide. It crystallizes in the trigonal system, and its crystal structure is the same as that of corundum (Al2O3). It has a Mohs hardness of 5-6.5 and has a slightly lower specific gravity than titanium dioxide,...
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