Element thought to exist on the surface of Mercury. It was detected in much higher abundancies by Messenger during a flyby than expected (similar to that of Calcium). It is evenly distributed over the globe, for some reason, unlike Calcium (near the equator), which is a puzzle. Also differently distributed than Sodium.
Mercury/Magnesium Web Pages
Mercury/Magnesium In the News
Magnesium Detected in Mercury's Atmosphere (May 2009)