chrysolite

[Middle English crisolite, from Old French, from Medieval Latin crīsolitus, from Latin chrȳsolithus, from Greek khrūsolithos, topaz : khrūso-, chryso- + lithos, stone.]

A yellow-green gemstone used as an amulet by ancient Romans to protect the wearer from melancholy and enchantment. It was set in gold to dispel nightmares. Its virtue was also said to be enhanced if a hole was made in it and the hairs of a donkey passed through.

The noun has one meaning:

Meaning #1: a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone