Chrysolite
Chrysolite , noun
[Latin chrysolithos, Greek {not transcribed}; chryso`s gold + {not transcribed} stone: compare French chrysolithe.]
(Mineralogy) A mineral, composed of silica, magnesia, and iron, of a yellow to green color. It is common in certain volcanic rocks; -- called also olivine and peridot. Sometimes used as a gem. The name was also early used for yellow varieties of tourmaline and topaz.