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]

The Collaborative International Dictionary of English v.0.48:

Heliotrope \He"li*o*trope\, n. [F. h['e]liotrope, L.
   heliotropium, Gr. ?; ? the sun + ? to turn, ? turn. See
   Heliacal, Trope.]
   1. (Anc. Astron.) An instrument or machine for showing when
      the sun arrived at the tropics and equinoctial line.
      [1913 Webster]

   2. (Bot.) A plant of the genus Heliotropium; -- called also
      turnsole and girasole. Heliotropium Peruvianum is
      the commonly cultivated species with fragrant flowers.
      [1913 Webster]

   3. (Geodesy & Signal Service) An instrument for making
      signals to an observer at a distance, by means of the
      sun's rays thrown from a mirror.
      [1913 Webster]

   4. (Min.) See Bloodstone
      (a) .
          [1913 Webster]

   Heliotrope purple, a grayish purple color.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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