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A hematite

Hematite or haematite is the main ore of iron. It is mostly iron(III) oxide. Millions of tons are dug up every year to feed to blast furnaces to make steel.

It has a metallic luster. It has no cleavage (the way a mineral breaks), but does have a fracture. The fracture is irregular and uneven. Hematite on the hardness scale is 5 to 6. It has a bright red to dark red streak. To find the streak, you take a piece of unglazed porcelain and take the mineral and run it across the plate. The colors vary from metallic gray to a dark, rough and earthy red color. Hematite has a chemical formula of Fe2O3.

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