Source : Webster's Revised Unabridged Dictionary (1913)

Rhodochrosite \Rho`do*chro"site\, n. [Gr. "ro`don the rose + ???
   a coloring.] (Min.)
   Manganese carbonate, a rose-red mineral sometimes occuring
   crystallized, but generally massive with rhombohedral
   cleavage like calcite; -- called also {dialogite}.

Source : WordNet®

rhodochrosite
     n : a mineral consisting of manganese carbonate; a source of
         manganese