Martian Meteorites

Just like our moon, Mars also lacks an atmosphere. When asteroids make contact with the Red Planet, fragments eject from the impact and occasionally make their way into Earth’s orbit. If the stone survives its cataclysmic entry into Earth, it lands on the ground and becomes known as a meteorite. Once studied under a microscope by scientists, their origins are plotted and the stone is cataloged. The Interstellar Collection offers a wide array of genuine, scientifically-classified Martian meteorites.

How do scientists know for sure it's from Mars?  Thanks to the Viking spacecraft that landed on Mars in 1976, scientists have revealed small amounts of gas/rare isotopes trapped within these types of meteorites and concluded its the same composition to the atmosphere on Mars.