The Collaborative International Dictionary of English v.0.48:

Hematite \Hem"a*tite\, n. [L. haematites, Gr. ? bloodlike, fr.
   a"i^ma, a"i`matos, blood.] (Min.)
   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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rhombohedral \Rhom`bo*he"dral\, a. (Geom. & Crystallog.)
   Related to the rhombohedron; presenting the form of a
   rhombohedron, or a form derivable from a rhombohedron;
   relating to a system of forms including the rhombohedron and
   scalenohedron.
   [1913 Webster]

   Rhombohedral iron ore (Min.) See Hematite.

   Rhombohedral system (Crystallog.), a division of the
      hexagonal system embracing the rhombohedron,
      scalenohedron, etc.
      [1913 Webster]