Chrys·o·lite n. Min. 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.
n : a brown or yellow-green olivine found in igneous and
metamorphic rocks and used as a gemstone