This meteorite, EETA 79001, found on the ice in Antarctica, & is almost certainly from Mars. The cube at the lower right is 1 cm on a side. The meteorite is partly covered by a black glassy layer, the fusion crust. Inside, the meteorite is gray. It is a basalt, very similar to basalts found on Earth. It formed in a volcanic eruption about 180 million years ago. This meteorite contains a small amount of gas that is chemically identical to the martian atmosphere.