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:

Bloodstone \Blood"stone`\, n. (Min.)
   (a) A green siliceous stone sprinkled with red jasper, as if
       with blood; hence the name; -- called also heliotrope.
   (b) Hematite, an ore of iron yielding a blood red powder or
       "streak."
       [1913 Webster]

WordNet (r) 3.0 (2006):

bloodstone
    n 1: green chalcedony with red spots that resemble blood [syn:
         bloodstone, heliotrope]