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Hematite is a gemstone form of iron oxide. It is the principal ore of iron and one of the few gemstones that exhibits a metallic luster. Hematite enhances mental activity. Balances yin/yang energies and emotions.

Like most other gemstones with a metallic luster, hematite is remarkably dense and possesses an extremely high refractive index. In fact, its specific gravity and refractive index is much higher than that of corundum, zircon and even diamond. Its name, 'hematite', is derived from the Greek word for blood, (though it should not be confused with 'bloodstone", which is chalcedony quartz) since its color is red when thinly sliced or powdered. Its color lends it well to industrial use as a red pigment, though nowadays, it is often substituted by cheaper materials.

When highly polished, hematite can sometimes appear like polished silver. As a gemstone in aggregate form, hematite is always opaque and typically occurs with blackish-gray color. However, in thin crystals, it is actually transparent and exhibits a reddish to brown color; this red-brown color can also be seen in specimens of the gem mentioned above, known as bloodstone; chalcedony quartz. The 'drops of blood' visible in this quartz bloodstone are owed to traces of iron oxide, typically hematite. Corresponding Astrological signs: Aries and Aquarius.