Block Island
![Block Island Block Island](https://nasa3d.arc.nasa.gov/shared_assets/models/block-island/block-island-428x321.png)
Composition measurements by NASA's Mars Exploration Rover Opportunity confirm that this rock on the Martian surface is an iron-nickel meteorite. Researchers have informally named the rock "Block Island." With a width of about two-thirds of a meter (2 feet), it is the largest meteorite yet found on Mars.