what is hematite
Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe 2 O 3), one of several iron oxides.Hematite crystallizes in the rhombohedral lattice system, and it has the same crystal structure as ilmenite and corundum.Hematite and ilmenite form a complete solid solution at temperatures above 950 Â°C (1,740 Â°F). Hematite is a mineral, colored black to steel or silver-gray, brown to reddish brown, or red.ematite crystallizes in the rhombohedral lattice system, and it has the same crystal structure as ilmenite and corundum. Hematite and ilmenite form a complete solid solution at temperatures above 950 Â°C (1,740 Â°F).