Posted by tourdemars to General News at October 23, 2003 12:00 PM

Large outcrops of a gemstone mineral commonly used in jewellery have been found on the surface of Mars. On Earth, the mineral olivine takes the form of the brilliant green gemstone peridot. An instrument aboard a Nasa spacecraft spotted a 30,000 square kilometre area rich in olivine in the Nili Fossae region of Mars.