Hematite
Hematite , noun
[Latin haematites, Greek {not transcribed} bloodlike, from a"i^ma, a"i`matos, blood.]
(Mineralogy) 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.