On July 15, NASA announced that the Curiosity rover came across an oddly-shaped meteorite while exploring the Red Planet. Apparently, the meteorite is made of iron. It is quite a big piece, with a slightly smaller one that sits in its proximity and is visible in the foreground. The astronomers have agreed to name the oversized chunk of meteorite Lebanon, while the smaller one close to it Lebanon B, NASA goes on to detail on its website.

In a press release, NASA researchers explain that the Curiosity rover found a meteorite that’s resting on the Red Planet’s surface some time ago, on May 25. The images gathered by the Curiosity rover indicate that Lebanon measures approximately 2 meters (roughly 6.5 feet) in width and sports several cavities on its surface. Although smaller, Lebanon B looks strikingly similar.

Scientists believe that Lebanon and Lebanon B got the cavities from erosion. They also say that it is possible that the cavities were left behind by crystals that are now no longer part and parcel of their makeup.

“The image shows angular shaped cavities on the surface of the rock. One possible explanation is that they resulted from preferential erosion along crystalline boundaries within the metal of the rock,” NASA explains. “Another possibility is that these cavities once contained olivine crystals, which can be found in a rare type of stony-iron meteorites called pallasites, thought to have been formed near the core-mantle boundary within an asteroid.”

Several other iron meteorites were discovered on Mars’s surface over the years, and scientists thought that the reasons why meteorites are more common on the Red Planet than stone ones is that iron space rocks are more likely to survive erosion.

Iron meteorites were also found on Earth. However, as is the case with space rocks that were documented on the Red Planet so far, iron meteorites tend to be few and far between on our planet.