I noticed this earlier but decided to pass. Now I have to respond. In case it comes up on your Jeopardy appearance, olivine is a volcanic mineral, generally yellowish-green. When it's transparent and of gem quality it's called peridot (pear-uh-doe) and was known to the ancients as chrysolite. Interestingly, the most famous source for it is St. John's Island in the Red Sea near the Egyptian coast. It's also found in meteorites called pallasites and is the only non-organic gemstone found in Hawaii.