The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dialogite \Di*al"o*gite\, n. [From Gr. ? an arguing.] (Min.)
   Native carbonate of manganese; rhodochrosite.
   [1913 Webster]