An important ore of iron, the sesquioxide, so called because of the red color of the powder. It occurs in splendent rhombohedral crystals, and in massive and earthy forms; -- the last called red ocher. Called also specular iron, oligist iron, rhombohedral iron ore, and bloodstone. See Brown hematite, under Brown.
an important form of iron ore that is very widely distributed. Hematite occurs in many different forms. The powdered mineral is metallic to dull in luster, dull to bright red in color. One form of hematite that is found in the Tucson area is specular hematite, which has a metallic, purple color in crushed form.