Mars Description From WikipediaEdit
"Section Head" a Martian meteorite is a rock that formed on the planet Mars. It was ejected from Mars by the impact of an asteroid or comet, and landed on Earth. Of over 61,000 meteorites that have been found on Earth, 114 were identified as martian (as of January 9, 2013). These meteorites are thought to be from Mars because they have elemental and isotopic compositions that are similar to rocks and atmosphere gases analyzed by spacecraft on Mars.
On January 3, 2013, NASA reported that a meteorite, named NWA 7034 (nicknamed "Black Beauty"), found in 2011 in the Sahara desert, was determined to be from Mars and found to contain ten times the water of other Mars meteorites found on Earth. " The meteorite was determined to have formed 2.1 billion years ago during the Amazonian geologic period on Mars." (all came from wikipedia)