Source : Webster's Revised Unabridged Dictionary (1913)

Essonite \Es"so*nite\, n. [Named from Gr. ? inferior, because
   not so hard as some minerals it resembles, e. g., hyacinth.]
   (Min.)
   Cinnamon stone, a variety of garnet. See {Garnet}.

Source : WordNet®

essonite
     n : a garnet ranging in color from yellow to brown [syn: {cinnamon
         stone}, {hessonite}]