Hematite is the crystallized version of the mineral iron oxide (Fe2O3). It is one of the most common minerals in the world, and its weathered form is found in many types of rocks and soil. The color of this mineral ranges from black, grey, to brown, or red, and they all have a metallic sheen to them. The crystallized form is in the rhombohedral formation. Technically, it is not really a crystal, but a mineral.
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