Zimbabwe's 2.5-Billion-Year Great Dyke Captured in Space Image
A 2010 astronaut photo from the ISS highlights the Great Dyke of Zimbabwe—a 342-mile-long, 2.5-billion-year-old lopolith rich in platinum, chromite and other metals—making it one of Earth's oldest and most mineral-rich igneous intrusions and a major mining hotspot along its length.