Hematite

Quite often called Haematite, Kidney Ore, or Red Iron Ore.

The "Hematite" widely sold as jewellery or magnetic items is an artificially created material and not related to the natural Hematite.
"Magnetic Hematite" is usually composed of a barium-strontium ferrite magnet (Ba,Sr)Fe₁₂O₁₉

Mineral Species: Oxides

Chemical Formula: Fe₂O₃

Mohs Scale Hardness: 5 - 6

Location: Worldwide

Typical Appearance: Steel-grey to black metallic appearance. Can be reddish brown in mineral specimens.