Chemical Formula: (Mg, Fe)2SiO4
Color: Most are green, but can also be yellow or brown
Importance: Is an ore of magnesium. Magnesium from olivine is used in fireworks, metal alloys, and car parts. Also acts as a flux, or purifier, in steel production. This means that magnesium as added to liquid steel during manufacturing so that it does not oxidize.
Other Interesting Information: Most people know of olivine’s gemstone variety, peridot, which is green olivine that is transparent. Is also known to be part of many rocks, especially mafic igneous rocks.
My Take: One of my favorite things about olivine is that it forms in small grains that cluster to form the mineral. Only a few other minerals do this, making olivine truly unique.
For More Information: http://www.minerals.net/mineral/olivine.aspx