Source : Webster's Revised Unabridged Dictionary (1913)

Olivine \Ol"i*vine\, n. [Cf. F. olivine.] (Min.)
   A common name of the yellowish green mineral chrysolite, esp.
   the variety found in eruptive rocks.

Source : WordNet®

olivine
     n : a mineral consisting of magnesium iron silicate; a source of
         magnesium